Diego Sebastián Schwartzman (] , ] ; born 16 August 1992) is an Argentine professional tennis player competing mainly on the ATP Tour.
 He has won one ATP singles title, and reached a career-high singles ranking of world No. 28 in 2017.
 He is a clay court specialist, and is noted for his "deadly" return game.
The PSA World Series 2015–16 is a series of men's and women's squash tournaments which are part of the Professional Squash Association (PSA) World Tour for the end of the 2015 and the start of the 2016 squash season.
 The PSA World Series tournaments are some of the most prestigious events on the men's and women's tour.
 The best-performing players in the World Series events qualify for the annual 2016 Men's PSA World Series Finals and 2016 Women's PSA World Series Finals tournament.
 Grégory Gaultier won the men's 2016 PSA World Series against Cameron Pilley and Laura Massaro won the women's 2016 PSA World Series against Raneem El Weleily.
The PSA World Series 2013 is a series of men's squash tournaments which are part of the Professional Squash Association (PSA) World Tour for the 2013 squash season.
 The PSA World Series tournaments are some of the most prestigious events on the men's tour.
 The best-performing players in the World Series events qualify for the annual 2013 PSA World Series Finals tournament.
 Ramy Ashour won his first PSA World Series Squash Finals trophy, beating Mohamed El Shorbagy in the final.
The PSA World Series 2011 is a series of men's squash tournaments which are part of the Professional Squash Association (PSA) World Tour for the 2011 squash season.
 The PSA World Series tournaments are some of the most prestigious events on the men's tour.
 The best-performing players in the World Series events qualify for the annual 2011 PSA World Series Finals tournament.
 Amr Shabana won his first PSA World Series Squash Finals trophy, beating Grégory Gaultier in the final.
The WSA World Series 2011 is a series of women's squash tournaments which are part of the Women's Squash Association (WSA) World Tour for the 2011 squash season.
 The WSA World Series tournaments are some of the most prestigious events on the women's tour.
 The best-performing players in the World Series events qualify for the annual 2011 WSA World Series Finals tournament.
 Nicol David won her first WSA World Series Squash Finals trophy, beating Madeline Perry in the final.
The PSA Super Series 2010 is a series of men's squash tournaments which are part of the Professional Squash Association (PSA) World Tour for the 2010 squash season.
 The PSA Super Series tournaments are some of the most prestigious events on the men's tour.
 The best-performing players in the Super Series events qualify for the annual 2010 PSA World Series Finals tournament.
 Nick Matthew and Amr Shabana managed to reach the final of the 2010 PSA World Series Squash Finals, but this year there was no winner, because the venue at the Queens Club arena where the final was due to take place was damaged by gales.
The WSA World Series 2012 is a series of women's squash tournaments which are part of the Women's Squash Association (WSA) World Tour for the 2012 squash season.
 The WSA World Series tournaments are some of the most prestigious events on the women's tour.
 The best-performing players in the World Series events qualify for the annual 2012 WSA World Series Finals tournament.
 Nicol David won her second WSA World Series Squash Finals trophy, beating Laura Massaro in the final.
Diego Schwartzman was the defending champion, but did not qualify this year.
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The PSA World Series 2012 is a series of men's squash tournaments which are part of the Professional Squash Association (PSA) World Tour for the 2012 squash season.
 The PSA World Series tournaments are some of the most prestigious events on the men's tour.
 The best-performing players in the World Series events qualify for the annual 2012 PSA World Series Finals tournament.
 Amr Shabana won his second PSA World Series Squash Finals trophy, beating Nick Matthew in the final.
The PSA World Series 2016–17 is a series of men's and women's squash tournaments which are part of the Professional Squash Association (PSA) World Tour for the end of the 2016 and the start of the 2017 squash season.
 The PSA World Series tournaments are some of the most prestigious events on the men's and women's tour.
 The best-performing players in the World Series events qualify for the annual 2017 Men's PSA World Series Finals and 2017 Women's PSA World Series Finals tournament.

Question: Diego Schwartzmann won the annual finals tournament in 2014, but failed to qualify to defend it in 2015, at which sport?
Answer: tennis