Isner, Roddick advance at Delray Beach

Top seed John Isner and fourth seed Andy round victories Tuesday at the Delray Beach International Tennis Championships.

The 6-foot-9 Isner held off wild card and fellow American Jesse Levine 6-4, 7-6 (17-15) on the hardcourts at Delray Beach Stadium and Tennis Center. The massive-serving Isner fired up 13 aces and was not broken on Day 2.

Isner will battle another fellow American, Ryan Sweeting, in the round of 16 here.

Roddick failed to break the serve of Germany's Philipp Petzschner as he dropped the first set, but the American converted on 4-of-6 break chances from there en route to the 4-6, 6-4, 6-1 victory.

The former world No. 1 Roddick, who was the runner-up here 10 years ago, reeled off nine aces in the match, while Petzschner committed seven double faults and could only break Roddick's serve twice.

Second-seeded Croat Marin Cilic was sent packing by Finnish veteran Jarkko Nieminen, 6-3, 3-6, 6-2.

Another upset came when Belgian Steve Darcis doused third-seeded Serb Viktor Troicki 6-4, 4-6, 6-4.

Fifth-seeded German Philipp Kohlschreiber shut down Belgian Olivier Rochus 6-1, 6-4.

Seventh-seeded South African slugger Kevin Anderson avoided an upset by dismissing American qualifier Austin Krajicek 6-1, 6-4, and Russia's Alex Bogomolov Jr., the tournament's sixth seed, eased past American Michael Yani 6-3, 6-1 in a little over an hour.

Five-time finalist Xavier Malisse moved on with a 7-6 (7-3), 6-3 victory over Spaniard Guillermo Garcia-Lopez. The Delray Beach stalwart Malisse was the champion here in 2005 and 2007 and runner-up in 1999, 2001 and 2006.

Latvian Ernests Gulbis, who titled here two years ago, leveled Colombian Alejandro Falla 6-4, 6-1, and American Tim Smyczek ousted last week's winner in Memphis, Austria's Jurgen Melzer, 6-4, 2-6, 7-5.

Additional opening-round wins came for Croat Ivan Dodig and Australia's Marinko Matosevic, who upended 2010 Delray runner-up, Ivo Karlovic.

The 2012 Delray Beach winner will collect $75,780.