# Dirk Dier

Dirk Dier (born 16 February 1972) is a former professional tennis player from Germany.

## Career

Dier, an under 12s and 14s national champion, was a semi finalist in the Orange Bowl. In 1990, he defeated Leander Paes to win the boys' singles event in the Australian Open and also finished runner-up in the juniors at Queen's that year. He appeared in the main draw of a Grand Slam for the first time at the 1990 Wimbledon Championships, where he lost in the opening round to countryman Michael Stich.
His other two Grand Slam appearances came in 1996. The German exited in the first round of the 1996 French Open, to Félix Mantilla in four sets, but reached the second round in the US Open, with a win over Chuck Adams. He then faced second seed Thomas Muster, who beat him in straight sets.
Dier made just one quarter-final during his career on the ATP Tour, which was in the 1996 Bermuda Open. En route he defeated two top 100 players, Michael Joyce and Nicolás Lapentti.
As of September 2019, he is the coach of Angelique Kerber.

## Junior Grand Slam finals
### Singles: 1 (1 title)

| Result | Year | Tournament | Surface | Opponent | Score |
| Win | 1990 | Australian Open | Hard | Leander Paes | 6–4, 7–6$^{(7–4)}$ |

## ATP Challenger and ITF Futures finals
### Singles: 11 (5–6)

* Legend
* ATP Challenger (5–6)
* ITF Futures (0–0)
* Finals by surface
* Hard (0–0)
* Clay (4–4)
* Grass (0–0)
* Carpet (1–2)
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Win | 1–0 | Jul 1993 | Seville, Spain | Challenger | Clay | Oliver Fernández | 6–3, 6–3 |
| Loss | 1–1 | Jun 1994 | Furth, Germany | Challenger | Clay | Kris Goossens | 7–6, 3–6, 2–6 |
| Loss | 1–2 | Jun 1995 | Eisenach, Germany | Challenger | Clay | Wojtek Kowalski | 6–7, 3–6 |
| Win | 2–2 | Jul 1995 | Seville, Spain | Challenger | Clay | Tati Rascón | 7–5, 6–2 |
| Loss | 2–3 | Oct 1995 | Guayaquil, Ecuador | Challenger | Clay | Kris Goossens | 4–6, 4–6 |
| Loss | 2–4 | Oct 1996 | Mallorca, Spain | Challenger | Clay | Dominik Hrbatý | 3–6, 2–6 |
| Loss | 2–5 | Feb 1997 | Lippstadt, Germany | Challenger | Carpet | Arne Thoms | 6–7, 3–6 |
| Win | 3–5 | Jun 1997 | Weiden, Germany | Challenger | Clay | Tamer El Sawy | 7–6, 6–3 |
| Win | 4–5 | Feb 1998 | Lippstadt, Germany | Challenger | Carpet | Marzio Martelli | 7–6, 4–3 ret. |
| Loss | 4–6 | Feb 1998 | Wolfsburg, Germany | Challenger | Carpet | Ivo Heuberger | 7–6, 4–6, 4–6 |
| Win | 5–6 | May 1998 | Dresden, Germany | Challenger | Clay | Markus Hantschk | 0–6, 6–1, 6–4 |

### Doubles: 16 (6–10)

* Legend
* ATP Challenger (6–9)
* ITF Futures (0–1)
* Finals by surface
* Hard (1–1)
* Clay (2–3)
* Grass (0–0)
* Carpet (3–6)
| Result | W–L | Date | Tournament | Tier | Surface | Partner | Opponents | Score |
| Loss | 0–1 | Dec 1993 | Hong Kong, Hong Kong | Challenger | Hard | Alexander Mronz | Tommy Ho Shuzo Matsuoka | 3–2 ret. |
| Loss | 0–2 | Feb 1995 | Wolfsburg, Germany | Challenger | Carpet | Lars Koslowski | Martin Sinner Joost Winnink | 5–7, 3–6 |
| Win | 1–2 | May 1995 | Jerusalem, Israel | Challenger | Hard | Christian Saceanu | Lionel Barthez Patrick Baur | 7–6, 7–6 |
| Win | 2–2 | Jun 1995 | Weiden, Germany | Challenger | Clay | Lars Koslowski | Brent Larkham Emilio Benfele Álvarez | 6–3, 6–3 |
| Win | 3–2 | Jun 1995 | Eisenach, Germany | Challenger | Clay | Lars Koslowski | Sébastien Leblanc Chris Woodruff | 3–6, 6–3, 7–6 |
| Win | 4–2 | Feb 1996 | Wolfsburg, Germany | Challenger | Carpet | Arne Thoms | Jim Pugh Joost Winnink | 6–4, 6–4 |
| Loss | 4–3 | Dec 1997 | Bad Lippspringe, Germany | Challenger | Carpet | Lars Koslowski | Tuomas Ketola Michael Kohlmann | 6–4, 3–6, 5–7 |
| Loss | 4–4 | Jul 1998 | Ulm, Germany | Challenger | Clay | Michael Kohlmann | Márcio Carlsson Jaime Oncins | 4–6, 7–6, 3–6 |
| Loss | 4–5 | Feb 1999 | Wolfsburg, Germany | Challenger | Carpet | Karsten Braasch | Adriano Ferreira Maurice Ruah | walkover |
| Loss | 4–6 | Mar 1999 | Magdeburg, Germany | Challenger | Carpet | Jan-Ralph Brandt | Michael Hill Andrew Painter | 6–7, 7–6, 6–7 |
| Loss | 4–7 | Jun 1999 | Eisenach, Germany | Challenger | Clay | Marcus Hilpert | Mitch Sprengelmeyer Jason Weir-Smith | 3–6, 1–6 |
| Loss | 4–8 | Jul 1999 | Ulm, Germany | Challenger | Clay | Michael Kohlmann | Andrew Painter Byron Talbot | 3–6, 4–6 |
| Win | 5–8 | Dec 1999 | Nümbrecht, Germany | Challenger | Carpet | Jens Knippschild | Andreas Tattermusch Andreas Weber | 6–3, 7–5 |
| Loss | 5–9 | Feb 2000 | Lübeck, Germany | Challenger | Carpet | Karsten Braasch | Giorgio Galimberti Diego Nargiso | 4–6, 4–6 |
| Win | 6–9 | Mar 2000 | Magdeburg, Germany | Challenger | Carpet | Karsten Braasch | Tomas Behrend Michael Kohlmann | 7–5, 7–6$^{(8–6)}$ |
| Loss | 6–10 | Oct 2000 | France F21, Forbach | Futures | Carpet | Bjorn Jacob | Matthias A. Muller Andreas Tattermusch | 3–6, 6–7$^{(4–7)}$ |

## Performance timeline

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

### Singles

| Tournament | 1989 | 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | SR | W–L | Win % |
| Grand Slam tournaments |||||||||||||||
| Australian Open | Q2 | A | A | A | A | A | A | A | A | Q1 | Q2 | 0 / 0 | 0–0 | – |
| French Open | A | A | A | A | Q1 | Q3 | A | 1R | Q3 | Q1 | Q1 | 0 / 1 | 0–1 | 0% |
| Wimbledon | A | 1R | A | A | Q2 | A | A | A | A | A | A | 0 / 1 | 0–1 | 0% |
| US Open | A | A | A | A | A | A | A | 2R | Q3 | A | A | 0 / 1 | 1–1 | 50% |
| Win–loss | 0–0 | 0–1 | 0–0 | 0–0 | 0–0 | 0–0 | 0–0 | 1–2 | 0–0 | 0–0 | 0–0 | 0 / 3 | 1–3 | 25% |
| ATP Masters Series |||||||||||||||
| Indian Wells | A | A | A | A | A | Q3 | A | Q1 | A | A | A | 0 / 0 | 0–0 | – |
| Miami | A | A | A | A | A | A | A | 1R | Q1 | A | A | 0 / 1 | 0–1 | 0% |
| Monte Carlo | A | A | A | A | Q2 | Q2 | Q2 | A | A | A | A | 0 / 0 | 0–0 | – |
| Hamburg | A | A | A | A | 2R | Q3 | A | A | Q1 | Q2 | A | 0 / 1 | 1–1 | 50% |
| Paris | A | A | A | A | A | Q1 | A | Q1 | A | A | A | 0 / 0 | 0–0 | – |
| Win–loss | 0–0 | 0–0 | 0–0 | 0–0 | 1–1 | 0–0 | 0–0 | 0–1 | 0–0 | 0–0 | 0–0 | 0 / 2 | 1–2 | 33% |