Question: Are Radek Štěpánek and Heather Watson both Grand Slam doubles champions?

Context paragraphs:
Heather Watson: Heather Miriam Watson (born 19 May 1992) is a British tennis player and a Wimbledon Mixed Doubles Champion.  She is a former British No.1 and current British No. 2 behind Johanna Konta.

2013 US Open – Men's Doubles: Bob Bryan and Mike Bryan were the defending champions, but lost in the semifinals to Leander Paes and Radek Štěpánek.  The loss ended the Bryan brothers' bid to win a calendar grand slam. <br>

2004 Indesit ATP Milan Indoor – Doubles: Petr Luxa and Radek Štěpánek were the defending champions but only Štěpánek competed that year with Martin Damm.

2002 CA-TennisTrophy – Doubles: Martin Damm and Radek Štěpánek were the defending champions but they competed with different partners that year, Damm with Cyril Suk and Štěpánek with Jiří Novák.

2007 Open 13 – Doubles: Martin Damm and Radek Štěpánek were the defending champions.  Damm did not participate this year.  Štěpánek partnered with Mahesh Bhupathi, but withdrew from the first round.

Judy Tegart-Dalton: Judy Tegart Dalton (née Tegart; born 12 December 1937) is a retired professional tennis player from Australia who won nine Grand Slam doubles titles.  She won at least one women's doubles title at each Grand Slam tournament, a "career Grand Slam".  Five of her doubles titles were with Margaret Court.  Tegart was the runner-up in 10 Grand Slam doubles tournaments.

2002 Canada Masters – Doubles: The 2002 Canada Masters – Doubles was the men's singles event of the one hundred and thirteenth edition of the Canada Masters; a WTA Tier I tournament and the most prestigious men's tennis tournament held in Canada.  Jiří Novák and David Rikl were the defending champions but they competed with different partners that year, Novák with Radek Štěpánek and Rikl with David Prinosil.  Novak and Štěpánek lost in the second round to Mark Knowles and Daniel Nestor.  Prinosil and Rikl lost in the semifinals to Bob Bryan and Mike Bryan.  The Bryans won in the final 4–6, 7–6, 6–3 against Knowles and Nestor.

Williams sisters: 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.

Radek Štěpánek: Radek Štěpánek (] ; born 27 November 1978) is a professional tennis player from the Czech Republic.  His career-high singles ranking is world No. 8 and best doubles ranking is world No. 4.  Štěpánek's biggest achievements are reaching two Masters 1000 event finals and the quarterfinals of Wimbledon in 2006, as well as winning the deciding match for Czech Republic's Davis Cup winning team in 2012 and again in 2013.  In doubles, he won his first Grand Slam title at the 2012 Australian Open, along with Indian partner Leander Paes, defeating the Bryan Brothers in the final.  Paes and Štěpánek also won the men's doubles title at the 2013 US Open, defeating Bruno Soares and Alexander Peya in the final.

2006 Dubai Tennis Championships – Men's Doubles: Martin Damm and Radek Štěpánek were the defending champions.  Damm partnered with Leander Paes, losing in the semifinals.  Štěpánek partnered with Tomáš Berdych, losing in the quarterfinals.

Supporting paragraphs: Heather Watson Radek Štěpánek
Answer: yes