 In what was a considerable upset, Kunitsyn defeated the former two-time Grand Slam winner and world No.1, 7–6, 6–7, 6–3 for his first and, to date, only professional title.In August 2008, he made the semifinals of the Legg Mason Tennis Classic, beating Mischa Zverev, Fabio Fognini, and Somdev Devvarman, before losing Viktor Troicki.