Question: Are Jean-Julien Rojer and Květa Peschke both professional tennis players?

Context articles: Marcin Matkowski
2007 Porsche Tennis Grand Prix – Doubles
Květa Peschke career statistics
2010 Farmers Classic
Květa Peschke
Horia Tecău
Jean-Julien Rojer
2007 Zurich Open – Doubles
Aisam-ul-Haq Qureshi
2010 Farmers Classic – Doubles

Marcin Matkowski (born 15 January 1981) is a Polish professional tennis player whose speciality is in doubles.
 His current partner is Leander Paes; they have been playing together since 2016.
 He played college tennis at UCLA, where his teammates included Jean-Julien Rojer.
The Doubles Tournament at the 2007 Porsche Tennis Grand Prix took place between 1 and 7 October on the indoor hard courts of the Porsche-Arena in Stuttgart, Germany.
 Květa Peschke and Rennae Stubbs won the title, defeating Chan Yung-jan and Dinara Safina in the final.
This is a list of the main career statistics of professional Czech tennis player Květa Peschke.
The 2010 Farmers Classic, presented by Mercedes-Benz, was a tennis tournament played on outdoor hard courts.
 It was the 84th edition of the Los Angeles Open, and was part of the Olympus US Open Series of the 2010 ATP World Tour.
 It took place at the Los Angeles Tennis Center in Los Angeles, California, United States, from July 26 through August 1, 2010.
 Sam Querrey defeated Andy Murray for the singles title.
 Bob and Mike Bryan won the doubles championship over Eric Butorac and Jean-Julien Rojer, who was playing on his college court.
 It marked the first time in the 84-year history of the tournament that both the singles and doubles championships were successfully defended.
 The twin brothers also set the record of 62 career doubles titles on the ATP Tour.
Květoslava Peschkeová, (née Hrdličková; born 9 July 1975) better known as Květa Peschke, is a professional tennis player from the Czech Republic.
Horia Tecău (] ; born January 19, 1985) is a Romanian tennis player currently ranked World No. 9 in doubles.
 He turned pro in 2003 and reached the men's doubles finals of the 2010, 2011 and 2012 Wimbledon Championships with Robert Lindstedt before winning it in 2015 with Jean-Julien Rojer, with whom he also won the 2017 US Open.
 Tecău also won the 2012 Australian Open mixed doubles title with Bethanie Mattek-Sands and the 2015 ATP World Tour Finals with Rojer.
Jean-Julien Rojer (] ; born 25 August 1981) is a Dutch professional tennis player from Curaçao.
 His highest ATP singles ranking is 218th, which he achieved on 15 August 2005.
 A doubles specialist, his career-high in doubles is World No. 3, which he reached in November 2015.
 His former doubles partners include Eric Butorac and Aisam-ul-Haq Qureshi.
 He currently plays with Horia Tecău of Romania, with whom he won the men's double titles in the 2015 Wimbledon and 2017 US Open championships.
 With Anna-Lena Grönefeld, he also won the mixed doubles' title at the 2014 French Open.
 He attended UCLA where he competed for the UCLA Bruins men's tennis team.
2007 Zurich Open – Doubles is the women's doubles tennis competition in the 2007 Zurich Open.
 Květa Peschke and Rennae Stubbs won in the final 7-5, 7-6 (1) against Lisa Raymond and Francesca Schiavone.
Aisam-ul-Haq Qureshi (Urdu: ‎ ) (born 17 March 1980) is a professional tennis player from Pakistan.
 He is currently Pakistan's top player.
 A top-10 doubles player, his highest singles ranking was no. 125.
 He is the only Pakistani tennis player to reach the final of a Grand Slam, which he did in 2010, competing in both mixed doubles (partnering with Květa Peschke) and men's doubles (partnering with Rohan Bopanna) at the US Open.
Bob and Mike Bryan successfully defended their title, defeating Eric Butorac and Jean-Julien Rojer in the finals 6–7, 6–2, [10–7].
 The twin brothers set a record of 62 career doubles titles on the ATP Tour, surpassing The Woodies (Todd Woodbridge and Mark Woodforde).
 Rojer, who was a UCLA tennis player (1999-2002), returned to play on his college home court.