Question: Are Yannick Noah and Julian Knowle both tennis players?

Context paragraphs:
Yannick Noah: Yannick Noah (born 18 May 1960) is a former professional tennis player from France.  He is best remembered for winning the French Open in 1983 and as a highly successful captain of France's Davis Cup and Fed Cup teams.  During his career, which spanned almost two decades, Noah captured a total of 23 singles titles and 16 doubles titles, reaching a career-high singles ranking of World No. 3 (in July 1986) and attaining the World No. 1 doubles ranking the following month.  Since his retirement from the game, Noah has remained in the public eye as a popular music performer and as the co-founder, with his mother, of a charity organization for underprivileged children.  Noah is also the father of Joakim Noah of the NBA New York Knicks.

2006 BMW Open – Doubles: Mario Ančić and Julian Knowle were the defending champions.  Ančić did not participate this year.  Knowle partnered with Jürgen Melzer, losing in the first round.

2010 Pilot Pen Tennis – Men's Doubles: Julian Knowle and Jürgen Melzer were the defending champions, but Melzer chose not to participate this year.As a result, Knowle partnered with Andy Ram, but they lost to Robert Lindstedt and Horia Tecău in the semifinals.  Lindstedt and Tecău went on to win the tournament, after defeating Rohan Bopanna and Aisam-ul-Haq Qureshi in the final 6–4, 7–5.

Julian Knowle: Julian Knowle (born 29 April 1974) is an Austrian male professional tennis player.  Being a born left-hander, Knowle is now one of the few on the ATP Tour who plays his forehand, backhand, and even volleys double-handed.  He was Austria's most successful doubles player in history by reaching world no. 6 in the ATP doubles rankings in January 2008, before being matched by Jürgen Melzer, who reached no. 6 in September 2010, and overtaken by Alexander Peya, who reached no. 3 in August 2013.

2016 UniCredit Czech Open – Doubles: Julian Knowle and Philipp Oswald were the defending champions, but Oswald chose not to compete this year. <br>Knowle instead competed with Marcelo Demoliner.  Demoliner and Knowle lost in the first round to Facundo Bagnis and Sergio Galdós.

2013 Bet-at-home Cup Kitzbühel – Doubles: František Čermák and Julian Knowle were the defending champions but decided not to participate together.  Knowle teamed up with Leonardo Mayer, but lost in the first round to Daniel Brands and Michal Mertiňák. <br> Čermák played alongside Lukáš Dlouhý, but lost in the final to Martin Emmrich and Christopher Kas, 4–6, 3–6.

2003 Croatia Open – Doubles: František Čermák and Julian Knowle were the defending champions but only Knowle competed that year with Lovro Zovko.

All Star Tennis '99: All Star Tennis '99 is a simulation tennis game for the Nintendo 64, PlayStation, and Game Boy Color released in 1999, that was developed by Smart Dog and published by Ubisoft.  The featured player on the USA and Europe versions is Michael Chang while in the French version the featured player is Yannick Noah who, has his name above the title as Yannick Noah All Star Tennis '99.  It was one of the first tennis games for the N64 and the only one for that system in the "USA" until Mario Tennis.  It was preceded by Let's Smash/Centre Court Tennis in Japan and Europe, for the Nintendo 64, while being one of many "tennis" games on PlayStation and Game Boy Color.

2014 Grand Prix Hassan II – Doubles: Julian Knowle and Filip Polášek were the defending champions, but Polášek chose not to participate.  Knowle plays alongside Christopher Kas, but they lost in the first round to Tomasz Bednarek and Lukáš Dlouhý. <br>

2014 PBZ Zagreb Indoors – Doubles: Julian Knowle and Filip Polášek were the defending champions, but Polášek decided not to participate.  Knowle played alongside Johan Brunström, but they lost in the quarterfinals to Marcelo Demoliner and Purav Raja.

Supporting paragraphs: Yannick Noah Julian Knowle
Answer: professional tennis player