# Lucas Arnold Ker

Lucas Arnold Ker (Spanish pronunciation:; born 12 October 1974) is an Argentine former professional tennis player.
Arnold Ker started playing tennis in the Olivos Tenis Club of Buenos Aires, under coach Malcolm Campbell. He is the younger brother of Patricio Arnold. He is right-handed and turned professional in 1994. He played several times for the Argentine Davis Cup team, where he made his debut in 1997 against Venezuela. Arnold Ker was Roger Federer's opponent in the latter's first professional match in 1998, beating the 17-year-old future singles world No. 1 and 20-time major singles champion in straight sets. Arnold Ker retired from professional tennis in 2016.

## Cancer

In August 2006, he was diagnosed with testicular cancer. The testicle was removed, and he successfully underwent chemotherapy. In 2008, he was in remission and returned to playing professional tennis.

## ATP Tour career finals
### Doubles: 33 (15 titles, 18 runner-ups)

* Legend
* Grand Slam tournaments (0–0)
* ATP World Tour Finals (0–0)
* ATP World Tour Masters 1000 (0–0)
* ATP World Tour 500 Series (0–5)
* ATP World Tour 250 Series (15–13)
* Titles by surface
* Hard (0–1)
* Clay (15–15)
* Grass (0–0)
* Carpet (0–2)
* Titles by setting
* Outdoor (15–16)
* Indoor (0–2)
| Result | W–L | Date | Tournament | Tier | Surface | Partner | Opponents | Score |
| Win | 1–0 | Aug 1996 | San Marino, San Marino | World Series | Clay | Pablo Albano | Mariano Hood Sebastián Prieto | 6–1, 6–3 |
| Loss | 1–1 | Oct 1996 | Valencia Open, Spain | World Series | Clay | Pablo Albano | Lucas Arnold Jack Waite | 7–6, 3–6, 4–6 |
| Win | 2–1 | Jun 1999 | Merano Open, Italy | World Series | Clay | Jaime Oncins | Marc-Kevin Goellner Eric Taino | 6–4, 7–6$^{(7–1)}$ |
| Win | 3–1 | Aug 1999 | San Marino, San Marino | World Series | Clay | Mariano Hood | Petr Pála Pavel Vízner | 6–3, 6–2 |
| Win | 4–1 | Sep 1999 | Majorca Open, Spain | World Series | Clay | Tomás Carbonell | Alberto Berasategui Francisco Roig | 6–1, 6–4 |
| Win | 5–1 | Oct 1999 | Bucharest, Romania | World Series | Clay | Martín García | Marc-Kevin Goellner Francisco Montana | 6–3, 2–6, 6–3 |
| Loss | 5–2 | Feb 2000 | Pacific Coast Championships, United States | World Series | Hard | Eric Taino | Jan-Michael Gambill Scott Humphries | 1–6, 4–6 |
| Win | 6–2 | Mar 2000 | Bogotá, Colombia | International Series | Clay | Pablo Albano | Joan Balcells Mauricio Hadad | 7-6$^{(7–4)}$, 1–6, 6–2 |
| Loss | 6–3 | Jul 2000 | Stuttgart Open, Germany | International Gold | Clay | Donald Johnson | Jiří Novák David Rikl | 7–5, 2–6, 3–6 |
| Win | 7–3 | Feb 2001 | Movistar Open, Chile | International Series | Clay | Tomás Carbonell | Mariano Hood Sebastián Prieto | 6–4, 2–6, 6–3 |
| Win | 8–3 | Feb 2001 | Buenos Aires, Argentina | International Series | Clay | Tomás Carbonell | Mariano Hood Sebastián Prieto | 5–7, 7–5, 7–6$^{(7–5)}$ |
| Loss | 8–4 | Feb 2002 | Movistar Open, Chile | International Series | Clay | Luis Lobo | Gastón Etlis Martín Rodríguez | 3–6, 4–6 |
| Loss | 8–5 | Apr 2002 | Barcelona, Spain | International Gold | Clay | Gastón Etlis | Michael Hill Daniel Vacek | 4–6, 4–6 |
| Loss | 8–6 | Jul 2002 | Kitzbühel, Austria | International Gold | Clay | Àlex Corretja | Robbie Koenig Thomas Shimada | 6–7$^{(3–7)}$, 4–6 |
| Win | 9–6 | Sep 2002 | Palermo, Italy | International Series | Clay | Luis Lobo | František Čermák Leoš Friedl | 6–4, 4–6, 6–2 |
| Loss | 9–7 | Feb 2003 | Buenos Aires, Argentina | International Series | Clay | David Nalbandian | Mariano Hood Sebastián Prieto | 2–6, 2–6 |
| Loss | 9–8 | Apr 2003 | Estoril, Portugal | International Series | Clay | Mariano Hood | Mahesh Bhupathi Max Mirnyi | 1–6, 2–6 |
| Win | 10–8 | May 2003 | Valencia, Spain | International Series | Clay | Mariano Hood | Brian MacPhie Nenad Zimonjić | 6–1, 6–7$^{(7–9)}$, 6-4 |
| Loss | 10–9 | Jul 2003 | Båstad, Sweden | International Series | Clay | Mariano Hood | Simon Aspelin Massimo Bertolini | 7–6$^{(7–3)}$, 0–6, 4–6 |
| Win | 11–9 | Sep 2003 | Palermo, Italy | International Series | Clay | Mariano Hood | František Čermák Leoš Friedl | 7-6$^{(8–6)}$, 6–7$^{(3–7)}$, 6–3 |
| Loss | 11–10 | Oct 2003 | Swiss Indoors, Switzerland | International Series | Carpet | Mariano Hood | Mark Knowles Daniel Nestor | 4–6, 2–6 |
| Win | 12–10 | Feb 2004 | Buenos Aires, Argentina | International Series | Clay | Mariano Hood | Federico Browne Diego Veronelli | 7–5, 6–7$^{(2–7)}$, 6–4 |
| Loss | 12–11 | Jul 2003 | Kitzbühel, Austria | International Gold | Clay | Martín García | František Čermák Leoš Friedl | 3–6, 5–7 |
| Win | 13–11 | Sep 2004 | Bucharest, Romania | International Series | Clay | Mariano Hood | José Acasuso Óscar Hernández | 7–6$^{(7–5)}$, 6–1 |
| Win | 14–11 | Oct 2004 | Palermo, Italy | International Series | Clay | Mariano Hood | Gastón Etlis Martín Rodríguez | 7–5, 6–2 |
| Loss | 14–12 | Oct 2004 | Swiss Indoors, Switzerland | International Series | Carpet | Mariano Hood | Bob Bryan Mike Bryan | 6–7$^{(9–11)}$, 2–6 |
| Loss | 14–13 | Apr 2005 | Valencia, Spain | International Series | Clay | Mariano Hood | Fernando González Martín Rodríguez | 4–6, 4–6 |
| Win | 15–13 | May 2005 | Sankt Pölten, Austria | International Series | Clay | Paul Hanley | Martin Damm Mariano Hood | 6–3, 6–4 |
| Loss | 15–14 | Aug 2005 | Sopot, Poland | International Series | Clay | Sebastián Prieto | Mariusz Fyrstenberg Marcin Matkowski | 6–7$^{(7–9)}$, 4–6 |
| Loss | 15–15 | Apr 2006 | Estoril, Portugal | International Series | Clay | Leoš Friedl | Lukáš Dlouhý Pavel Vízner | 3–6, 1–6 |
| Loss | 15–16 | Jul 2006 | Amersfoort, Netherlands | International Series | Clay | Christopher Kas | Alberto Martín Fernando Vicente | 4–6, 3–6 |
| Loss | 15–17 | Jul 2008 | Kitzbühel, Austria | International Gold | Clay | Olivier Rochus | James Cerretani Victor Hănescu | 3–6, 5–7 |
| Loss | 15–18 | Feb 2009 | Brasil Open, Brazil | 250 Series | Clay | Juan Mónaco | Marcel Granollers Tommy Robredo | 4–6, 5–7 |

## ATP Challenger and ITF Futures finals
### Singles: 5 (2–3)

* Legend
* ATP Challenger (2–3)
* ITF Futures (0–0)
* Finals by surface
* Hard (0–0)
* Clay (2–3)
* Grass (0–0)
* Carpet (0–0)
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Loss | 0–1 | Aug 1996 | Merano, Italy | Challenger | Clay | Juan-Albert Viloca-Puig | 6–7, 4–6 |
| Win | 1–1 | Aug 1997 | Merano, Italy | Challenger | Clay | Vincenzo Santopadre | 6–1, 6–4 |
| Win | 2–1 | Sep 1997 | São Paulo, Brazil | Challenger | Clay | Fernando Meligeni | 6–4, 1–0 ret. |
| Loss | 2–2 | Apr 1998 | Paget, Bermuda | Challenger | Clay | Hernán Gumy | 6–7, 6–4, 2–6 |
| Loss | 2–3 | Jun 1998 | Braunschweig, Germany | Challenger | Clay | Franco Squillari | 2–6, 6–4, 1–6 |

### Doubles: 28 (20–8)

* Legend
* ATP Challenger (19–7)
* ITF Futures (1–1)
* Finals by surface
* Hard (1–1)
* Clay (19–7)
* Grass (0–0)
* Carpet (0–0)
| Result | W–L | Date | Tournament | Tier | Surface | Partner | Opponents | Score |
| Win | 1–0 | Jan 1994 | Mar del Plata, Argentina | Challenger | Clay | Patricio Arnold | Filippo Messori Federico Mordegan | 6–4, 7–5 |
| Win | 2–0 | May 1994 | Bogotá, Colombia | Challenger | Clay | Pablo Campana | Danilo Marcelino Nuno Marques | 3–6, 7–6, 7–6 |
| Loss | 2–1 | Mar 1995 | Punta Del Este, Uruguay | Challenger | Clay | Pablo Albano | Christian Miniussi Diego Pérez | 6–4, 5–7, 1–6 |
| Win | 3–1 | Jul 1995 | São Paulo, Brazil | Challenger | Hard | Pablo Albano | Otavio Della Marcelo Saliola | 6–2, 4–6, 6–1 |
| Win | 4–1 | May 1996 | Ljubljana, Slovenia | Challenger | Clay | Pablo Albano | Rikard Bergh Shelby Cannon | 6–1, 3–6, 6–1 |
| Loss | 4–2 | Jun 1996 | Cali, Colombia | Challenger | Clay | Patricio Arnold | Brett Hansen-Dent T J Middleton | 4–6, 3–6 |
| Win | 5–2 | Jul 1996 | Ostend, Belgium | Challenger | Clay | David Škoch | Wim Neefs Yuri Soberon | 7–6, 6–1 |
| Loss | 5–3 | Apr 1997 | Paget, Bermuda | Challenger | Clay | Daniel Orsanic | Mark Knowles Javier Frana | 3–6, 7–6, 3–6 |
| Win | 6–3 | May 1997 | Ljubljana, Slovenia | Challenger | Clay | Daniel Orsanic | David Škoch Fernon Wibier | 6–0, 6–4 |
| Win | 7–3 | Aug 1997 | Graz, Austria | Challenger | Clay | Tom Vanhoudt | Alberto Martín Albert Portas | 6–1, 6–2 |
| Win | 8–3 | Oct 1997 | Santiago, Chile | Challenger | Clay | Jaime Oncins | Diego del Río Mariano Puerta | 6–2, 6–2 |
| Win | 9–3 | Nov 1997 | Palmar, Puerto Rico | Challenger | Clay | Daniel Orsanic | Mariano Hood Sebastián Prieto | 7–5, 3–6, 6–3 |
| Win | 10–3 | Feb 1999 | Punta Del Este, Uruguay | Challenger | Clay | Marcelo Filippini | Paulo Carvallo Gonzalo Rodríguez | 6–1, 6–4 |
| Loss | 10–4 | Mar 1999 | Salinas, Ecuador | Challenger | Hard | Daniel Orsanic | Mariano Hood Sebastián Prieto | 2–6, 6–7 |
| Win | 11–4 | Nov 2000 | Montevideo, Uruguay | Challenger | Clay | Gastón Etlis | Joan Balcells Germán Puentes | 6–4, 6–4 |
| Win | 12–4 | Nov 2000 | Buenos Aires, Argentina | Challenger | Clay | Pablo Albano | Sergio Roitman Andrés Schneiter | 6–3, 4–6, 6–2 |
| Win | 13–4 | May 2003 | Zagreb, Croatia | Challenger | Clay | Mariano Hood | Simon Aspelin Todd Perry | 6–1, 6–3 |
| Win | 14–4 | Jul 2003 | Košice, Slovakia | Challenger | Clay | Mariano Hood | Rubén Ramírez Hidalgo Salvador Navarro | 2–1 ret. |
| Win | 15–4 | Sep 2004 | Szczecin, Poland | Challenger | Clay | Mariano Hood | Óscar Hernández Alberto Martín | 6–0, 6–4 |
| Loss | 15–5 | Sep 2005 | Argentina F12, Buenos Aires | Futures | Clay | Diego Cristin | Emiliano Massa Leonardo Mayer | 6–7$^{(4–7)}$, 3–6 |
| Loss | 15–6 | Oct 2005 | Santiago, Chile | Challenger | Clay | Giovanni Lapentti | Daniel Köllerer Oliver Marach | 4–6, 3–6 |
| Win | 16–6 | Nov 2005 | Buenos Aires, Argentina | Challenger | Clay | Sebastián Prieto | Rubén Ramírez Hidalgo Santiago Ventura | 6–0, 6–4 |
| Win | 17–6 | Jul 2006 | Biella, Italy | Challenger | Clay | Agustín Calleri | Juan Martín del Potro Martín Vassallo Argüello | 7–6$^{(7–5)}$, 6–2 |
| Win | 18–6 | Oct 2007 | Argentina F18, Tandil | Futures | Clay | Lionel Noviski | Máximo González Diego Junqueira | 6–3, 6–2 |
| Win | 19–6 | Jul 2009 | Scheveningen, Netherlands | Challenger | Clay | Máximo González | Thomas Schoorel Nick van der Meer | 7–5, 6–2 |
| Win | 20–6 | Aug 2009 | San Marino, San Marino | Challenger | Clay | Sebastián Prieto | Johan Brunström Jean-Julien Rojer | 7–6$^{(7–4)}$, 2–6, [10–7] |
| Loss | 20–7 | Oct 2009 | Buenos Aires, Argentina | Challenger | Clay | Máximo González | Brian Dabul Sergio Roitman | 7–6$^{(7–4)}$, 0–6, [8–10] |
| Loss | 20–8 | Nov 2015 | Buenos Aires, Argentina | Challenger | Clay | Guido Andreozzi | Horacio Zeballos Julio Peralta | 2–6, 5–7 |

## Performance timelines

Key :
| W | F | SF | QF | #R | RR | Q# | DNQ | A | NH |

### Singles

| Tournament | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | SR | W–L | Win % |
| Grand Slam Tournaments ||||||||||
| Australian Open | A | A | A | A | 1R | 1R | 0 / 2 | 0–2 | 0% |
| French Open | A | A | A | Q1 | 2R | Q3 | 0 / 1 | 1–1 | 50% |
| Wimbledon | A | A | A | A | 1R | A | 0 / 1 | 0–1 | 0% |
| US Open | A | A | A | A | 3R | A | 0 / 1 | 2–1 | 67% |
| Win–loss | 0–0 | 0–0 | 0–0 | 0–0 | 3–4 | 0–1 | 0 / 5 | 3–5 | 38% |
| ATP Tour Masters 1000 ||||||||||
| Indian Wells Masters | A | A | A | Q1 | Q1 | A | 0 / 0 | 0–0 | – |
| Miami Open | Q1 | A | A | 2R | 2R | A | 0 / 2 | 1–2 | 33% |
| Hamburg | A | A | A | A | Q1 | A | 0 / 0 | 0–0 | – |
| Italian Open | A | A | A | A | 1R | A | 0 / 1 | 0–1 | 0% |
| Stuttgart | A | A | A | Q1 | Q1 | A | 0 / 0 | 0–0 | – |
| Win–loss | 0–0 | 0–0 | 0–0 | 0–1 | 1–2 | 0–0 | 0 / 3 | 1–3 | 25% |

### Doubles

| Tournament | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | SR | W–L | Win % |
| Grand Slam Tournaments |||||||||||||||||||
| Australian Open | A | 1R | 3R | A | 2R | 3R | 1R | 1R | A | A | A | 3R | 3R | 2R | A | 0 / 9 | 10–9 | 53% |
| French Open | SF | 1R | 1R | 2R | QF | 3R | QF | 1R | 3R | 1R | A | 3R | 1R | A | 1R | 0 / 13 | 17–13 | 57% |
| Wimbledon | A | A | A | 1R | 3R | 1R | 1R | 2R | 1R | 1R | A | 2R | 1R | A | A | 0 / 9 | 4–9 | 31% |
| US Open | A | 2R | A | 2R | 2R | 1R | 3R | 2R | 1R | 1R | A | 2R | 1R | A | 1R | 0 / 11 | 7–11 | 39% |
| Win–loss | 4–1 | 1–3 | 2–2 | 2–3 | 7–4 | 4–4 | 5–4 | 2–4 | 2–3 | 0–3 | 0–0 | 6–4 | 2–4 | 1–1 | 0–2 | 0 / 42 | 38–42 | 48% |
| ATP Tour Masters 1000 |||||||||||||||||||
| Indian Wells Masters | Q1 | 1R | A | A | 2R | 2R | 1R | 1R | 1R | A | A | A | A | A | A | 0 / 6 | 2–6 | 25% |
| Miami Open | 2R | QF | A | A | 2R | 3R | 1R | 1R | 2R | A | A | A | 1R | A | A | 0 / 8 | 6–8 | 43% |
| Monte-Carlo Masters | A | A | A | 2R | 1R | 2R | 1R | 1R | 1R | A | A | A | 1R | A | A | 0 / 7 | 2–7 | 22% |
| Rome Masters | A | 1R | A | 1R | SF | 2R | A | 1R | 1R | A | A | A | A | A | A | 0 / 6 | 4–6 | 40% |
| Hamburg | A | QF | A | QF | 1R | 1R | A | 1R | 1R | A | A | A | NMS | NMS | NMS | 0 / 6 | 4–6 | 40% |
| Cincinnati Masters | A | A | A | A | 1R | 1R | A | A | A | A | A | A | A | A | A | 0 / 2 | 0–2 | 0% |
| Stuttgart | 2R | 2R | A | Q2 | 2R | Not Held | Not Held | Not Held | Not Held | Not Held | Not Held | Not Held | Not Held | Not Held | Not Held | 0 / 3 | 3–3 | 50% |
| Madrid Masters | Not Held | Not Held | Not Held | Not Held | Not Held | 1R | 2R | A | A | A | A | A | A | A | A | 0 / 2 | 1–2 | 33% |
| Paris Masters | A | A | A | A | 2R | 1R | 1R | A | A | A | A | 2R | A | A | A | 0 / 4 | 2–4 | 33% |
| Win–loss | 2–2 | 5–5 | 0–0 | 3–3 | 6–8 | 5–8 | 1–5 | 0–5 | 1–5 | 0–0 | 0–0 | 1–1 | 0–2 | 0–0 | 0–0 | 0 / 44 | 24–44 | 35% |

### Mixed doubles

| Tournament | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | SR | W–L | Win % |
| Grand Slam Tournaments |||||||||||||||||
| Australian Open | A | 1R | A | A | 1R | 2R | 1R | 2R | A | A | A | A | A | 0 / 5 | 2–5 | 29% |
| French Open | 2R | A | A | 1R | A | 1R | A | QF | 1R | A | A | A | A | 0 / 5 | 3–5 | 38% |
| Wimbledon | A | A | A | 1R | 2R | 1R | 1R | 2R | 2R | 1R | A | A | 2R | 0 / 8 | 3–8 | 27% |
| US Open | A | A | A | 1R | 2R | A | A | A | A | A | A | A | A | 0 / 2 | 1–2 | 33% |
| Win–loss | 1–1 | 0–1 | 0–0 | 0–3 | 2–3 | 1–3 | 0–2 | 3–3 | 1–2 | 0–1 | 0–0 | 0–0 | 1–1 | 0 / 20 | 9–20 | 31% |