Bernard Tomic has set up a second-round showdown with Ukrainian fourth seed Alexandr Dolgopolov, after a hard-fought win at the Memphis Open.
The 22-year-old Australian rallied after a sloppy first set on Tuesday to oust Dutchman Igor Sijsling 4-6 6-3 6-2.
The world No.49 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.
Sam Groth also advanced, the big-serving Aussie took just over an hour to defeat Taiwan's Yen-Hsun Lu in straight sets.
Groth dropped just three points on his booming first serve to win 6-4 6-3.
Groth will take on South African second seed Kevin Anderson, who like Tomic's opponent Dolgopolov received a first-round bye.
While it was a good day for those two it was less so for 18-year-old whiz-kid Thanasi Kokkinakis, who fell 6-3 6-4 to fellow qualifier Denis Kudla from the United States.
Also booking a spot in the round of 16 was Croatian fifth seed Ivo Karlovic who blasted 23 aces in his defeat of Slovakian Lukas Lacko 7-6 (9-7) 6-3.
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.
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