Are both Ivan Dodig and Justin Gimelstob tennis players?
yes
Ivan Dodig
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.
Justin Gimelstob
Justin Jeremy Gimelstob (born January 26, 1977) is a retired American tennis player.
 Gimelstob has been a resident of Morristown, New Jersey, and as of 2009 lived in Santa Monica, California.
2005 China Open – Men's Doubles
Justin Gimelstob and Graydon Oliver were the defending champions, but Oliver did not participate this year.
 Gimelstob partnered Nathan Healey and successfully defended his title. 2000 Nottingham Open – Doubles
Patrick Galbraith and Justin Gimelstob were the defending champions, but did not partner together this year.
 Galbraith partnered Brian MacPhie, losing in the quarterfinals.
 Gimelstob partnered Jared Palmer, losing in the first round. 2000 Franklin Templeton Tennis Classic – Doubles
Justin Gimelstob and Richey Reneberg were the defending champions, but Gimelstob did not participate this year.
 Reneberg partnered Jared Palmer, successfully defending his title. 2001 Kroger St. Jude International – Doubles
Justin Gimelstob and Sébastien Lareau were the defending champions but only Gimelstob competed that year with Jared Palmer. 1999 Legg Mason Tennis Classic – Doubles
Grant Stafford and Kevin Ullyett were the defending champions.
 Stafford chose not to participate this year.
 Ullyett partnered with Piet Norval but lost in the semifinals to the eventual champions Justin Gimelstob and Sébastien Lareau.
 <BR>Justin Gimelstob and Sébastien Lareau won in the final over David Adams and John-Laffnie de Jager, 7–5, 7–6. 2006 China Open – Men's Doubles
Justin Gimelstob and Nathan Healey were the defending champions, but Gimelstob did not participate this year.
 Healey partnered Ashley Fisher, losing in the first round. 1999 Nottingham Open – Doubles
Justin Gimelstob and Byron Talbot were the defending champions, but Talbot did not partner this year.
 Gimelstob partnered Patrick Galbraith. 2001 Canada Masters – Doubles
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.