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The world number 50, Istomin, defeated Igor Sijsling with the score 4:6, 6:3, 6:4, 6:2. The match lasted two hours.
During the match, Denis Istomin served three aces against seven of Sijsling. Uzbek player made two double faults against nil of the Dutch.
Sijsling won two break points in the match, while Istomin claimed five break points from 17.
In the second round, Denis Istomin will face Andreas Seppi from Italy, who is the 21st seeded player of the tournament.