Stockholm - Defending champion Grigor Dimitrov has advanced to the quarter-finals of the Stockholm Open by defeating Russia's Teymuraz Gabashvili 7-5, 7-6 (4) on Wednesday.
The Bulgarian, who had a bye into the second round, was put under pressure in both sets but needed just one match point to seal his tie-breaker victory.
Spain's Fernando Verdasco beat Jarko Nieminen of Finland 6-3, 6-4 to set up a quarter-final match against Bernard Tomic.
The Australian beat third-seeded Kevin Anderson of South Africa 7-6 (4), 6-4.
In first-round matches, Jack Sock of the United States defeated Andrey Golubev of Kazakhstan in three sets and France's Pierre-Hugues Herbert beat Pablo Carreno Busta of Spain.
Germany's Dustin Brown was facing Christian Lindell for a spot in the second round in a late match Wednesday.