Delray Beach - Top seed Tommy Haas and eighth seed Lleyton Hewitt breezed into the second round on Tuesday at the $474 000 ATP Delray Beach Open, but Taiwan's Lu Yen-Hsun retired after a first-set win.
World number 12 Haas, a 35-year-old German who won the event in 2006, needed only 55 minutes to eliminate US qualifier Wayne Odesnik 6-2, 6-1 while 32-year-old Aussie Hewitt, cheered on by countryman and golf legend Greg Norman, took 65 minutes to oust American Bradley Klahn 6-3, 6-1.
Haas' win secured a second-round match against US qualifier Steve Johnson, who defeated Kazak Mikhail Kukushkin 6-4, 6-3.
Hewitt, who now has 598 ATP match wins, will next face fellow Aussie Marinko Matosevic, who downed Belgian David Goffin 6-2, 6-4.
Taiwan's Lu, meanwhile, who was coming off a retirement due to a neck injury in a Memphis semi-final against Croatian Ivo Karlovic, won his first set 6-4 but retired against Ryan Harrison after the American held serve to open the second set on Tuesday.
Harrison will next meet Russian Teymuraz Gabashvili, who rallied to beat Aussie Matthew Ebden 2-6, 6-3, 6-2.
South African fourth seed Kevin Anderson, who lives in Delray Beach, reached the second round by fighting back to beat American Tim Smyczek 4-6, 6-1, 6-3.
Next in Anderson's path is Karlovic, who opened with a 7-6 (7/4), 6-3 victory over Aussie lucky loser Samuel Groth.
Results on Tuesday from the $474,000 ATP Delray Beach Open (x denotes seeding):
Kevin Anderson (RSA x4) bt Tim Smyczek (USA) 4-6, 6-1, 6-3
Marcos Baghdatis (CYP) bt Jiri Vesely (CZE) 3-6, 6-2, 6-1
Dudi Sela (ISR) bt Alex Bogomolov Jr. (RUS) 6-0, 6-2
Lleyton Hewitt (AUS x8) bt Bradley Klahn (USA) 6-3, 6-1
Teymuraz Gabashvili (RUS) bt Matthew Ebden (AUS) 2-6, 6-3, 6-2
Steve Johnson (USA) bt Mikhail Kukushkin (KAZ) 6-4, 6-3
Marinko Matosevic (AUS) bt David Goffin (BEL) 6-2, 6-4
Ryan Harrison (USA) bt Lu Yen-Hsun (TPE) 4-6, 1-0, retired
Tommy Haas (GER x1) bt Wayne Odesnik (USA) 6-2, 6-1
Ivo Karlovic (CRO) bt Samuel Groth (AUS) 7-6 (7/4), 6-3
Rhyne Williams (USA) bt Alejandro Falla (COL) 6-3, 4-0, retired
Kei Nishikori (JPN x3) bt Gastao Elias (POR) 6-1, 5-7, 6-2