Gisela Dulko (born 30 January 1985, in Buenos Aires) is a retired professional tennis player from Argentina. Although she enjoyed a modest success in singles, reaching world no. 26, and winning four WTA Tour titles; her speciality has been doubles, where she has been a world no. 1 player. Partnering with Flavia Pennetta, Dulko won the 2010 WTA Tour Championships and the 2011 Australian Open in doubles. Also, Dulko reached the mixed doubles final at the 2011 US Open, with Edward Schwank. She is remembered for her ability to upset the big names on the tour, such as Maria Sharapova in the 2nd round of Wimbledon in 2009; and Samantha Stosur in the 3rd round of Roland Garros in 2011. She also beat Martina Navratilova in the 2nd round of Wimbledon in 2004 in Navratilova's final grand slam singles match.