Frederico Gil and Ivan Dodig were the defending champions, but Dodig decided not to participate.
The 2001 Canada Masters – Doubles was the men's doubles event of the one hundred and twelfth edition of the Canada Masters; a WTA Tier I tournament and the most prestigious men's tennis tournament held in Canada.
 Sébastien Lareau and Daniel Nestor were the defending champions but they competed with different partners that year, Lareau with Justin Gimelstob and Nestor with Sandon Stolle.
 Gimelstob and Lareau lost in the first round to Mark Knowles and Brian MacPhie, as did Nestor and Stolle to Jan-Michael Gambill and Simon Larose.
 Jiří Novák and David Rikl won in the final 6–4, 3–6, 6–3 against Donald Johnson and Jared Palmer.
The 2011 ATP World Tour Finals (also known as the 2011 Barclays ATP World Tour Finals for sponsorship reasons) was a tennis tournament that was played at the O Arena in London, United Kingdom between 20 and 27 November 2011.
 The defending champion in singles was world no. 4 Roger Federer, while the defending champions in doubles were Daniel Nestor and Nenad Zimonjić.
 However, they did not defend their title together as they separated after the 2010 event.
 Zimonjic formed a team with Michaël Llodra for the season, and Nestor partnered with Max Mirnyi.
 Federer successfully defended his crown, winning an unprecedented sixth title, while Nestor and Mirnyi captured the doubles title.
Ivan Dodig and Júlio Silva were the defending champions, however only Dodig chose to play this year.
 He competed with Lovro Zovko.
 They lost to Brian Dabul and Leonardo Mayer in the first round.
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.
Julien Benneteau and Nenad Zimonjić were the defending champions, but decided not to participate together.
 Benneteau played alongside Édouard Roger-Vasselin, but lost to Bob and Mike Bryan in the quarterfinals.
 Zimonjić teamed up with Daniel Nestor, but lost to the Bryan brothers in the semifinals.
 The Bryans became the new champions, defeating Ivan Dodig and Marcelo Melo 6–3, 3–6, [10–8] in the final.
Daniel Nestor and Édouard Roger-Vasselin were the defending champions, but chose not to compete together.
 Nestor played alongside Vasek Pospisil, but lost in the semifinals to Ivan Dodig and Marcelo Melo.
 Roger-Vasselin teamed up with Julien Benneteau, but lost in the first round to Milos Raonic and Nenad Zimonjić.
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.
Daniel Mark Nestor {'1': ", '2': ", '3': ", '4': "} (Serbian Cyrillic: Данијел Несторовић; born September 4, 1972 as Danijel Nestorović) is a Canadian professional tennis player.
 He is one of the foremost doubles players in tennis history due to his longevity and continued success at the top of the men's game.
 s of 2016 , he is 11th for most men's ATP titles in Open Era history.
 In January 2016, Nestor became the first doubles player in ATP history to win 1000 matches.
Ivan Dodig and Lovro Zovko were the defending champions but Dodig not to participate.
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Question: Are Ivan Dodig and Daniel Nestor both doubles specialists at tennis?
Answer: yes