Grand Slam (tennis) champions in boys' singles

Grigor Dimitrov (Bulgarian: Григор Димитров, born 16 May 1991) is a Bulgarian professional tennis player. His career-high ATP singles ranking is world No. 3, which he achieved in November 2017 after winning the ATP Finals.

Roger Federer (born 8 August 1981) is a Swiss professional tennis player who is ranked world No. 3 in men's singles tennis by the Association of Tennis Professionals (ATP). He has won 20 Grand Slam singles titles—the most in history by a male player—and has held the world No. 1 spot in the ATP rankings for a record total of 310 weeks (including a record 237 consecutive weeks) and was the year-end No. 1 five times, including four consecutive. Federer, who turned professional in 1998, was continuously ranked in the top ten from October 2002 to November 2016.

Andrew Stephen Roddick (born August 30, 1982) is an American former world No. 1 professional tennis player.

Ryan Sweeting (born July 14, 1987) is an American former professional tennis player.

Gaël Sébastien Monfils (born 1 September 1986) is a French professional tennis player. He reached a career-high ATP world No. 6 singles ranking on 7 November 2016. His career highlights include reaching two Grand Slam singles semifinals at the 2008 French Open and 2016 US Open and three ATP Tour Masters 1000 singles finals – two at the Paris Masters (2009, 2010) and the other at the Monte Carlo Masters (2016).

Richard Gabriel Cyr Gasquet (born 18 June 1986) is a French professional tennis player. His career-high ATP singles ranking is world No. 7, attained on 9 July 2007. He has won a total of 15 singles titles on the ATP Tour. His best performance in Grand Slam singles tournaments was reaching the semifinals of the 2007 and 2015 Wimbledon Championships and the semifinals of the 2013 US Open. His best performance in ATP World Tour Masters 1000 singles tournaments was being the runner-up in Hamburg in 2005 and Toronto in 2006 and 2012. He won the mixed doubles Grand Slam title at the 2004 French Open, partnering Tatiana Golovin. He won the men's doubles Olympic bronze medal in 2012 with his doubles partner Julien Benneteau. Gasquet is best known for his elegant groundstrokes and his one-handed backhand.

John Patrick McEnroe Jr. (born February 16, 1959) is an American tennis player. He was known for his shot-making artistry and volleying skills, and for confrontational on-court behavior that frequently landed him in trouble with umpires and tennis authorities.

Nicholas Hilmy "Nick" Kyrgios (/ˈkɪəriɒs/ KEER-ee-os; born 27 April 1995) is an Australian professional tennis player. He won the boys' singles event at the 2013 Australian Open and the boys' doubles event at the 2013 Wimbledon Championships. Kyrgios's biggest achievements to date are reaching the quarterfinals of the 2014 Wimbledon Championships, defeating ATP number 1 Rafael Nadal and Richard Gasquet en route, and the quarter finals of the 2015 Australian Open where he lost to Andy Murray in straight sets.

Stanislas Wawrinka (born 28 March 1985) is a Swiss professional tennis player. He reached a career-high Association of Tennis Professionals (ATP) world No. 3 singles ranking for the first time on 27 January 2014. His career highlights include three Grand Slam titles including the 2014 Australian Open, 2015 French Open and 2016 US Open, where he defeated the No. 1 player in the final on all three occasions, reaching the final of the 2017 French Open, winning an ATP Tour Masters 1000 title at the 2014 Monte-Carlo Masters, and reaching three other finals at 2008 Rome, 2013 Madrid and 2017 Indian Wells. As a competitor for 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.

Sir Andrew Barron Murray OBE (born 15 May 1987) is a British professional tennis player from Scotland. He has been ranked world No. 1 by the Association of Tennis Professionals (ATP) for 41 weeks, and finished as the year-end No. 1 in 2016. He has won three Grand Slam singles titles, including two at Wimbledon, and has reached eleven major finals in total. Murray was ranked in the top 10 for all but one month from July 2008 through October 2017, and finished no lower than No. 4 in eight of the nine year-end rankings during that span. Murray has won 46 ATP singles titles, including 14 ATP Masters 1000 events.