Lucie Šafářová (] ; born 4 February 1987) is a Czech professional tennis player from Brno.
 She is currently the WTA world No. 1 doubles player.
 Šafářová has won seven WTA tour singles titles, fifteen doubles titles and reached the quarterfinals of the 2007 Australian Open by upsetting defending champion Amélie Mauresmo in the fourth round.
 She reached her first Grand Slam semifinal at the 2014 Wimbledon Championships and her first Grand Slam final at the 2015 French Open.
 She also won the 2015 Australian Open, 2015 French Open, 2016 US Open, 2017 Australian Open and 2017 French Open women's doubles titles partnering with Bethanie Mattek-Sands.
The Williams sisters are two professional American tennis players: Venus Williams (b. 1980), a seven-time Grand Slam title winner (singles), and Serena Williams (b. 1981), twenty-three-time Grand Slam title winner (singles), both of whom were coached from an early age by their parents Richard Williams and Oracene Price.
 There is a noted professional rivalry between them – between the 2001 US Open and the 2017 Australian Open tournaments, they met in nine Grand Slam singles finals.
 They became the first two players, female or male, to play in 4 consecutive grand slam singles finals from the 2002 French Open to the 2003 Australian Open; Serena famously won all 4 to complete the first of two "Serena Slams".
 Between 2000 and 2016, a 17-year span, they collectively won 12 Wimbledon singles titles (Venus won 5 and Serena won 7).
 By winning the 2001 Australian Open women's doubles title, they became the 5th pair to complete the Career Doubles Grand Slam and the only pair to complete the Career Doubles Golden Slam.
 At the time, Venus and Serena were only 20 and 19 years old, respectively.
 Since then they have gone on to add another two Olympic gold medals in the 2008 Beijing Olympics and the 2012 London Olympics.
 Nearly a decade later, the duo would go on to win 4 consecutive grand slam doubles titles from 2009 Wimbledon through 2010 Roland Garros, which would catapult them to co-No.
 1 doubles players on 7 June 2010.
 Two weeks later, on 21 June 2010, Serena would hold the No. 1 singles ranking and Venus would be right behind her at No. 2 in singles.
 Their most recent grand slam doubles titles came at the 2012 Wimbledon & 2016 Wimbledon events.
 They remain very close, often watching each other's matches in support, even after one of them has been knocked out of a tournament.
Ivan Dodig and Marcelo Melo were the defending champions, but chose not to participate together.
 Melo played alongside Łukasz Kubot, but lost in the second round to Fabrice Martin and Édouard Roger-Vasselin.
 Dodig teamed up with Rohan Bopanna, but lost in the final to Pierre-Hugues Herbert and Nicolas Mahut, 4–6, 6–3, [6–10].
Ivan Dodig and Marcelo Melo were the defending champions, but Dodig chose not to participate this year.
 Melo played alongside Vasek Pospisil, but lost to John Peers and Henri Kontinen in the semifinals.
Marcelo Melo and Bruno Soares were the defending champions, but Soares chose to compete in Vienna instead.
 Melo was scheduled to play alongside Ivan Dodig, but withdrew due to an abdominal injury.
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Łukasz Kubot (; born May 16, 1982) is a Polish professional tennis player.
 Kubot is a doubles specialist and won the 2014 Australian Open men's doubles title with Robert Lindstedt as well as the 2017 Wimbledon men's doubles title with Marcelo Melo.
 He has also had success in singles, achieving a career-high singles ranking of World No. 41 in April 2010 and reaching the quarterfinals of the 2013 Wimbledon Championships.
 In 2013 he was awarded the Gold Cross of Merit by Polish President Bronisław Komorowski.
Ivan Dodig (born 2 January 1985) is a Croatian tennis player.
 His career-high ATP rankings are world No. 29 in singles and world No. 4 in doubles.
 Dodig is a Grand Slam champion after winning the 2015 French Open men's doubles title with Marcelo Melo.
Fabio Fognini (] ; born 24 May 1987) is an Italian professional tennis player who is currently ranked world No. 29 in men's singles by the Association of Tennis Professionals (ATP) and the current Italian No. 1.
 His career-high singles ranking is world No. 13, achieved in March 2014, and world No. 7 in doubles, achieved in July 2015.
 Fognini's most successful surface is red clay, upon which he won his four ATP singles titles in Stuttgart, Hamburg, Viña del Mar and Umag, reached the quarterfinals of the 2011 French Open and the semifinals of the 2013 Monte-Carlo Masters.
 Together with Simone Bolelli, Fognini won the 2015 Australian Open doubles event, becoming the first all Italian men's pair to win a Grand Slam title in the Open era.
Simone Bolelli (born 8 October 1985; ] ) is an Italian professional tennis player.
 Bolelli is a Grand Slam champion since he won the 2015 Australian Open doubles event with Fabio Fognini, becoming the first all Italian men's pair to win a Grand Slam title in the Open Era.
Ivan Dodig and Marcelo Melo were the defending champions, but chose not to participate together.
 Dodig teamed up with Rohan Bopanna, but lost in the quarterfinals to Melo who partnered Łukasz Kubot.
 Kubot and Melo lost in the semifinals to Jamie Murray and Bruno Soares.

Question: Who is a Grand Slam champion after winning the 2015 French Open men's doubles title with Marcelo Melo, Fabio Fognini or Ivan Dodig ?
Answer: Ivan Dodig