Australia's Marinko Matosevic upset Croatian Ivo Karlovic in the opening round of the Delray Beach International.
Matosevic triumphed 6-3, 6-4 to move through to the second round and he joins fellow Australian Bernard Tomic, who beat German veteran Tommy Haas 6-4, 6-3.
Tomic, the tournament's eighth seed, will next meet American Tim Smyczek, who dispensed of Austria's Juergen Melzer 6-4, 2-6, 7-5.
Other first-round winners included top seed John Isner, but Finn Jarkko Nieminen ousted Croatian second seed Marin Cilic 6-3, 3-6, 6-2 and Belgian Steve Darcis eliminated Serbian third seed Viktor Troicki 6-4, 4-6, 6-4.
ABC/AAPTags: tennis, sport, united-states First posted February 29, 2012 10:16:40