As the match wound down after barely 90 minutes, Istomin, ranked 43rd in the world, bulled his way to the final game with a crushing forehand that flashed past an out-of-breath Kunitsyn.

During the match, Denis Istomin broke his opponent seven times, while Kunitsyn won only one serve of Istomin. Uzbek player won 34 winners against 16 of the Russian player.

Istomin served 13 aces, while Kunitsyn had only one ace. Russian player also made two double faults.

In the second round, Denis Istomin will face defending champion Rafael Nadal of Spain.