Rafael Nadal advances at the Australian Wells Masters despite suffering with illness . Juan Martin del Potro beat Australian qualifier Marinko Matosevic 7-5 6-2 to continue his bid for a third title of 2012 . The 16-time grand slam winner beat Denis Kudla 6-4 6-1 to reach the third round . A stomach illness has ravaged the U.S. event , with four players forced to pull out last year 's . first seed Roger Federer wins his first singles match since the Australian Open to advance .
Rafael Nadal advances at the Australian Wells Masters despite suffering with illness . The 16-time grand slam winner beat Denis Kudla 6-4 6-1 to reach the third round . A stomach illness has ravaged the U.S. event , with four players forced to pull out last year 's . first seed Roger Federer wins his first singles match since the Australian Open to advance .