Croatian fifth seed Ivo Karlovic advanced to the second round of the ATP Memphis Open on Tuesday, blasting 23 aces to defeat Slovakian Lukas Lacko 7-6 (9/7), 6-3.
Croatia's Ivo Karlovic plays a shot during his men's singles in the 2015 Australian Open tennis tournament in Melbourne on January 21, 2015
Karlovic, ranked 25th, had won their only prior meeting in the first round at Wimbledon in 2009. The big-serving 35-year-old will next face US qualifier Austin Krajicek, who outlasted Kazakhstan's Mikhail Kukushkin 6-2, 6-7 (3/7), 7-6 (10/8).
Also booking a date in the round of 16 was Australian Bernard Tomic, who rallied to oust Dutchman Igor Sijsling 4-6, 6-3, 6-2.
Tomic, a 22-year-old German-born Aussie ranked 49th in the world, surrendered two service breaks in the opening set but saved 5-of-6 break points over the final two sets while breaking four times, three in the final set.
Tomic, who also won their first meeting last month at Sydney, advanced to a matchup with Ukranian fourth seed Alexandr Dolgopolov, who received a first-round bye along with Japanese top seed Kei Nishikori, South African second seed Kevin Anderson and US third seed John Isner.
US qualifier Ryan Harrison reached a second-round matchup with Nishikori by defeating Tunisia's Malek Jaziri 7-6 (7/3), 7-6 (7/1).