Los Angeles, July 28 (DPA) Father of twins Roger Federer probably can't wait to return to tennis, according to the wisdom of fellow parent Pete Sampras.

'He'll hit the road as soon as he can,' joked Sampras Monday during an appearance at the Los Angeles Open. 'I'm sure he will start playing 40 weeks a year.'

Sampras, 37, the father of boys aged three and six, said in a more serious vein that despite Federer's wife Mirka giving birth to a pair of girls last Thursday, elite tennis life would go on for Swiss the world number one.

'I can't see Roger changing diapers at 4 a.m. at the US Open. I'm sure they will have help. I don't think fatherhood will affect his game.

'It's a life-changer, but he's focussed on his tennis. He'll keep doing what's he's done the past few years.'

Sampras was on hand in the Royal Box at the Wimbledon final in London three weeks ago when Federer beat Andy Roddick to lift a 15th Grand Slam singles title and break the longstanding Sampras mark set in 2002 when he won the US Open over Andre Agassi and retired on the spot.

The flying London visit was a rare trip for the former great, who is perfectly content to stay in LA where he has a home and family life and golf courses nearby.