MEMPHIS, Tenn. (AP) Ivo Karlovic moved into the second round of the Memphis Open with a 7-6 (7), 6-3 victory over Lukas Lacko on Tuesday.
Bernard Tomic also advanced to the second round by defeating Igor Sijsling 4-6, 6-3, 6-2.
Japan's Kei Nishikori is the top seed and two-time defending champion. He received a first-round bye.
Karlovic, runner-up to Nishikori in this tournament a year ago, had 23 aces to overpower Lacko, who had a set point in the opening-set tiebreaker but failed to convert. Karlovic won the first set when Lacko netted a forehand.
In the second set, Karlovic broke Lacko for the only time in the match to take a 5-3 lead. Karlovic then served a love game with two aces and two service winners to advance.