Stanislas "Stan" Wawrinka (; born 28 March 1985) is a Swiss professional tennis player. He reached a career-high Association of Tennis Professionals (ATP) singles ranking of world No. 3 for the first time on 27 January 2014. His career highlights include three Grand Slam titles at the 2014 Australian Open, 2015 French Open and 2016 US Open (where he defeated the world No. 1 player in the final on all three occasions), reaching the final of the 2017 French Open, an ATP Tour Masters 1000 title at the 2014 Monte-Carlo Masters, and three other Masters finals at 2008 Rome, 2013 Madrid and 2017 Indian Wells. Representing Switzerland, Wawrinka won gold in doubles at the 2008 Beijing Olympics with teammate Roger Federer, and was also pivotal in the Swiss team's victory at the 2014 Davis Cup.