Tim Floyd has resigned as basketball coach at Southern California after allegations that he gave $1,000 in cash to a man who helped steer former star O.J. Mayo to the Trojans.

Yesterday, Floyd submitted a one-paragraph letter to USC athletic director Mike Garrett saying he was quitting because he no longer had full enthusiasm for his job.

In May, Yahoosports.com reported that onetime Mayo confidant Louis Johnson said Floyd made a payment of $1,000 to Rodney Guillory, a "runner" for sports agent Bill Duffy. Such a payment would be a major violation of NCAA rules.

The NCAA and the Pacific Ten Conference are investigating the allegations.

Penn State officials said star wrestler David Taylor has committed to the Nittany Lions and will join the team this fall.

The senior from St. Paris, Ohio, initially signed with Iowa State. But the Cyclones released him from his scholarship after former coach Cael Sanderson moved to Penn State.

Elsewhere: Less than a week after firing longtime coach Tom Green, Fairleigh Dickinson named assistant Greg Vetrone as interim coach through next season.

Auto racing

NASCAR driver Jeremy Mayfield tested positive for methamphetamine during a random drug screening May 1 at Richmond International Raceway, ESPN The Magazine reported, citing sources.

In court documents, it was revealed that Mayfield had admitted ingesting a double dosage of Claritin-D, an allergy medication, and the prescription drug Adderall XR immediately before the Richmond drug test conducted for NASCAR.

However, a third drug came up positive during the urine test. The name of the drug in question has been redacted from court documents

On Monday, ESPN The Magazine reported that the unidentified drug was methamphetamine. Neither NASCAR nor Mayfield is allowed to comment because of a court-mandated gag order.

Noteworthy

Pro golfer Ken Green's brother and girlfriend were killed in a recreational vehicle accident in which Green, who was driving, also was hurt.

Mississippi Department of Public Safety spokesman Jon Kalahar said that passengers William Y. Green, a resident of Indiantown, Fla., and Jean Marie Hodgin of Greensboro, N.C., were killed in the wreck near Hickory, Miss.

Belmont Stakes runner-up Dunkirk had surgery for a leg injury but is expected to return to racing as early as this fall.

Toronto FC of Major League Soccer released goalie Greg Sutton after acquiring defender Nick Garcia and the rights to forward Ali Gerba from San Jose.

Roger Federer pulled out of the Gerry Weber Open in Halle, Germany, a warm-up for Wimbledon, saying he is "overwhelmed" and "exhausted" after his French Open win.