New York:Pete Sampras withdrew from the Siebel Open on Tuesday, further delaying his return to tennis after a long absence. Sampras, who has not competed since winning the US Open in September, said he is not prepared to play a tournament. He and his wife, actress Bridgette Wilson, became first-time parents in November. The Siebel Open begins February 10 in San Jose, California. Australian Open winner Andre Agassi is entered, along with Michael Chang, who will begin his farewell tour in this tournament. "Unfortunately, I will be postponing my return to the competitive arena and am withdrawing," Sampras said in a statement released by his agent. "Although I have made significant progress in recent weeks, I am not fully prepared to compete at the highest level. It is disappointing to be unable to participate in San Jose, where I have enjoyed many successes in the past," he added. Siebel Open tournament chairman Barry MacKay expressed his displeasure about Sampras backing out, but maintained that his staff would now work even harder to ensure a successful event.