05/15/2010 05:12 am ET Updated May 25, 2011

Andre Agassi Feels 'Sick About' Pete Sampras Feud

Andre Agassi feels "sick about" his public feud with longtime rival Pete Sampras at a charity event over the weekend. The tennis star tells ESPN's Rick Reilly that "it was out of line" and "inappropriate."

Agassi says he has texted Sampras to ask if he can apologize in person, but has yet to hear back from his opponent.

On Saturday, the two clashed at a fundraiser for the American Red Cross efforts in Haiti. Sampras mocked Agassi's walking style and Agassi intimated that Sampras is a lousy tipper. Click here to watch the full exchange.