Question: Who was born on May 11, 1945 Thomaz Koch or Ana Ivanovic?

Context paragraphs:
Julie Coin: Julie Coin (] ; born 2 December 1982) is a retired French professional tennis player.  Coin recorded the biggest win of her career by defeating the world no. 1 ranked female singles player, and top seed, Ana Ivanovic at the 2008 US Open.  Her career-high singles ranking is world no. 60, achieved on 27 July 2009.  Her career-high doubles ranking is world no. 49, achieved on 19 April 2010.

António van Grichen: António van Grichen (born October 3, 1978 in Lisbon, Portugal) is a tennis coach, best known for being the former coach of former WTA World No. 1 Victoria Azarenka.  He has also coached Vera Zvonareva, Ana Ivanovic, and Jarmila Gajdošová, and as of August 2014, is the current coach of Marcos Baghdatis.

Thomaz Koch: Thomaz Koch (born May 11, 1945 in Porto Alegre), is a left-handed former tennis player from Brazil, who was a quarter-finalist at the French Open, Wimbledon and the U.S. National Championships.

Petra Cetkovská: Petra Cetkovská (] ; born 8 February 1985 in Prostějov, Czechoslovakia) is a professional tennis player from the Czech Republic.  She reached her career-high singles ranking world no. 25 in June 2012.  Over her career, Cetkovská has beaten top players: Marion Bartoli, Elena Dementieva, Ana Ivanovic, Angelique Kerber, Li Na, Agnieszka Radwańska, Caroline Wozniacki, and Vera Zvonareva.

Lucie Hradecká: Lucie Hradecká (] ; born 21 May 1985 in Prague) is a professional tennis player from the Czech Republic.  In her career, Hradecká has won 19 WTA doubles titles, and two Grand Slam titles, the 2011 French Open and the 2013 US Open, partnered both times by fellow Czech Andrea Hlaváčková.  The pair are also the 2012 Olympic silver medallists in doubles.  She has also won a mixed doubles Grand Slam title, the 2013 French Open with František Čermák.  Her biggest singles career highlight to date was defeating former world number one Ana Ivanovic in the first round of the 2015 Australian Open.

Patty Schnyder: Patty Schnyder (born 14 December 1978) is a Swiss professional tennis player.  She reached number 7 in the world rankings.  She twice defeated a reigning world no. 1 player in her career: Martina Hingis at the 1998 Grand Slam Cup and Jennifer Capriati at the 2002 Family Circle Cup.  In addition, she has defeated former number 1s Lindsay Davenport, Serena Williams, Arantxa Sánchez Vicario, Steffi Graf, Kim Clijsters, Justine Henin, Amélie Mauresmo, Maria Sharapova, Jelena Janković, Ana Ivanovic and Caroline Wozniacki.

Fiorella Bonicelli: Fiorella Bonicelli (born 21 December 1951) is a retired professional tennis player from Uruguay.  During her career, she won the 1975 French Open mixed doubles title with Thomaz Koch.  She also won the 1976 French Open women's doubles title with Gail Lovera, defeating Kathleen Harter and Helga Niessen Masthoff 6–4, 1–6, 6–3.  At the Fed Cup, her singles record is 11–4, and doubles record 6–8.  During her career, she reached one Grand Slam singles quarterfinal, at the 1978 French Open, where she lost to Virginia Ruzici 6–7, 6–4, 6–8.

Bruno Soares: Bruno Fraga Soares (] ; born February 27, 1982, in Belo Horizonte) is a professional tennis player from Brazil.  His highest singles ranking on the ATP Tour is World No. 221, which he reached in March 2004.  Primarily a doubles specialist, his career-high doubles ranking is World No. 2, which he achieved in October 2016.  After a few efforts, including a final in the 2012 US Open and the semifinals of the 2008 and 2013 French Opens, Soares finally won his first Grand Slam title at the 2016 Australian Open, partnering Jamie Murray and then followed that up with a second men's doubles title at the 2016 US Open.  He has also won three Grand Slam titles in Mixed Doubles, two at the US Open, in 2012 and 2014, and one at the Australian Open in 2016.  He was the third Brazilian tennis player to achieve this, after Maria Bueno and Thomaz Koch.

Ana Ivanovic: Ana Ivanovic (Serbian: Ана Ивановић, "Ana Ivanović" ; ] ; born 6 November 1987) is a retired Serbian tennis player.  She was ranked No. 1 in the world in 2008, after she had defeated Dinara Safina to win the 2008 French Open.  She was also the runner-up at the 2007 French Open and the 2008 Australian Open.  She also qualified for the annual WTA Tour Championships three times, in 2007, 2008 and 2014 and won the year-end WTA Tournament of Champions twice, in 2010 and 2011.

Nigel Sears: Nigel Sears (born 4 April 1957) is a British tennis coach, best known for coaching former top five players Amanda Coetzer, Daniela Hantuchová and Ana Ivanovic during his long career.  He is currently the coach of Ekaterina Makarova.

Supporting paragraphs: Thomaz Koch Ana Ivanovic
Answer: Thomaz Koch