Twin challenges for Federer at US Open

NEW YORK: Sleeping patterns are vital to top tennis players, so new father of twins Roger Federer knows he has his work cut out as he bids to become the first man in 84 years to win six straight US Opens.

Federer on Saturday kept his campaign to match Bill Tilden on track with a 4-6, 6-3, 7-5, 6-4 third-round win over old foe Lleyton Hewitt, also a father, and then took the time out to reflect on his new paternal responsibilities.