Serena perks up after coffee break

Lethargic and jetlagged, Serena Williams decided a coffee might give her a boost after losing her first set 6-0 at the Hopman Cup in Perth, Australia, on Monday.

It did the trick.

Williams recovered to beat Flavia Pennetta 0-6,6-3,6-0 on a scorching day and John Isner followed up with a 5-7, 7-5,7-6(4) win over Fabio Fognini to give the US a 2-0 lead over Italy in their Group A match at the mixed team tournament.