Juan Carlos Ferrero and Carlos Moyá were the defending champions and successfully defended their title, defeating Sébastien Grosjean and Fabrice Santoro in the final, 6–4, 6–4.
Janko Tipsarević (, ] ; born 22 June 1984) is a Serbian professional tennis player.
 His career-high singles ranking is world No. 8, achieved on 2 April 2012.
 In his career, he has won four ATP World Tour titles, one ATP doubles title, three Futures, and 15 Challenger titles.
 Tipsarević also won the 2001 Australian Open Junior title.
 Tipsarević has achieved two victories over a World No. 1 player, having defeated compatriot Novak Djokovic twice.
 He also has thirteen victories against other players in the top 10: four wins against Tomáš Berdych, and one each against Fernando González, Mikhail Youzhny, David Ferrer, James Blake, Gaël Monfils, Andy Murray and Juan Mónaco.
 He holds victories over former World No. 1 players Carlos Moyá, Marat Safin, Lleyton Hewitt, Juan Carlos Ferrero and Andy Roddick.
 His best results at a Grand Slam have been reaching the quarterfinals at the US Open in 2011 and 2012.
 He is only the second Serb to reach the final 16 at all four different grand slams.
Carlos Moyá and Juan Carlos Ferrero were the defending champions, but were eliminated in the round-robin competition.
Novak Djokovic was the defending champion, but lost in the final to Stan Wawrinka, 7–6, 4–6, 5–7, 3–6.
 This was the first time the men's singles champion at the US Open won the match after losing the first set since Juan Martín del Potro in 2009.
 This was also the first time the men's singles champion at the US Open won the title after being a match point down since Djokovic in 2011, with Wawrinka having saved a match point against Dan Evans in the 3rd round.
 As he had done in his 2 previous grand slam titles, Wawrinka again defeated the world No. 1 in the final.
Nicolás Almagro was the defending champion; however, he lost 1–6, 7–5, 2–6 to Juan Carlos Ferrero in the quarterfinals.
David Ferrer won in the final 6–3, 3–6, 6–1 against Juan Carlos Ferrero.
Stanislas Wawrinka (] ; born 28 March 1985) is a Swiss professional tennis player.
 Professionally called "Stan", 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 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, winning an ATP World Tour Masters 1000 title at the Monte-Carlo Masters in 2014, and reaching three other finals at 2008 Rome, 2013 Madrid and 2017 Indian Wells.
 He is sometimes considered as part of the newly established "Big Five", an expansion of the Big Four, which already consists of Roger Federer, Rafael Nadal, Novak Djokovic and Andy Murray.
Juan Carlos Ferrero Donat (] ; born 12 February 1980) is a retired professional tennis player, and a former world No. 1 player, from Spain.
 He captured the men's singles title at the 2003 French Open, and in September of that year, became the 21st player to hold the world No. 1 ranking.
 He was also the runner-up at the 2002 French Open and the 2003 US Open.
 His nickname is "Mosquito" due to his speed and his slight physical build.
 Ferrero retired from the game after the 2012 Valencia Open 500.
This is a list of the main career statistics of Swiss professional tennis player, Stan Wawrinka.
 To date, Wawrinka has won sixteen ATP singles titles, including three Grand Slam singles titles at the 2014 Australian Open, the 2015 French Open, and the 2016 US Open, and one ATP Masters 1000 title at the 2014 Monte-Carlo Rolex Masters.
 He was also a semifinalist at the 2013 US Open, the 2015 Australian Open, the 2015 US Open, and the 2013, 2014 and 2015 ATP World Tour Finals.
 He also has reached the quarterfinals at 2014 and 2015 Wimbledon.
 Wawrinka also won a gold medal partnering Roger Federer in men's doubles for Switzerland in the 2008 Summer Olympics in Beijing, beating Swedish team Simon Aspelin and Thomas Johansson.
 In 2014 Wawrinka was part of the Swiss National Team, winning the Davis Cup for the first time.
Hicham Arazi (Arabic: هشام أرازي‎ ‎ ; born 19 October 1973) is a former male tennis player from Morocco.
 He played professionally from 1993 to the end of 2007.
 The left-hander reached his career-high ATP Tour singles ranking of world No. 22 on November 5, 2001.
 During his career, Arazi captured one singles title, in Casablanca.
 "The Moroccan Magician" reached the quarter-finals of the Australian Open twice and the French Open twice.
 As well as the aforementioned nickname, some tennis analysts called him "The Moroccan McEnroe" due to his talent - he played with incredible touch, and often enjoyed the support of the crowd even when not at home.
 He led Patrick Rafter, winner of the US Open in 1997 and 1998, two sets to love during the first round of the latter tournament.
 In the third set he was upset with several line calls, telling umpire Norm Chryst to "get out of here", which sparked the beginning of Arazi's meltdown (and Rafter's comeback).
 During his career, he notably gained victories over former World No. 1s and Grand Slam champions Roger Federer, Andre Agassi, Yevgeny Kafelnikov, Marat Safin, Lleyton Hewitt, Juan Carlos Ferrero, Carlos Moyá and Jim Courier.
Juan Carlos Ferrero was the defending champion, but Alexandr Dolgopolov eliminated him in the semifinals.

Question: Juan Carlos Ferrero and Stan Wawrinka, are both what?
Answer: professional tennis player