Lleyton Hewitt has conceded that behind every tennis playing dad there was probably a nappy-changing mum.

Dad-of-two Hewitt, who stormed into the third round of Wimbledon with a straight sets win over fifth seed Juan Martin del Potro, said the support of his wife Bec - who rarely misses a match - helped him through.

The only other former champion still in the tournament, Roger Federer, is nudging closer to a record 15 grand slam tournament wins and is also approaching fatherhood, with partner Mirka expecting a baby soon.

When asked if he had any advice for him, Hewitt laughed and replied, "I hope Mirka's a good wife. Bec has been unbelievable for me. Made life a lot easier. I'm sure Mirka will be that kind of solid rock for Roger as well."

When asked if he was now any good at changing nappies, he said: "Yeah - Bec's better, but I'm not bad."