The BNP Paribas Open has seen some upset matches, along with numerous withdrawals due to a virus spreading throughout the area. Among the upsets so far, American Christina McHale took down the 2011 WTA player of the year Petra Kvitova in three sets, 2-6, 6-2, 6-3.
Jurgen Melzer, Gael Monfils and Vania King have battled against a stomach virus that is going around the area of play which so far has forced at least six players to withdraw from play. Vera Zvonareva also pulled out of play due to another virus not related to the other players.
Kvitova is still fighting a virus that she was infected with while in the Middle East and still feels a loss of energy and movement.
"I lost a little bit of my fitness so it was tough moving and having winners,'' said Kvitova. "McHale was moving very well so she played a lot of shots back. (And) my serve was not really good, too. She played very solid and she didn't make mistakes so it was tough.''
McHale will now go onto play against Angelique Kerber of Germany.
"I couldn't get a read on Kvitova's serve in the first set and I wasn't really moving very well, either,'' McHale said. "Then I just kind of hung in there early in the second. She played one service game where she gave me a couple of loose errors and then I got more comfortable as the match went along.''
The top seeds remain healthy; however, Switzerland's Roger Federer admits to not feeling perfect after he defeated Denis Kudla, 6-4, 6-1, in the second round. Federer seemed dazed in his post-match interview and claims to have had a fever.
World number two-ranked Rafael Nadal looked strong after he quickly advanced over Leonardo Mayer in straight sets, 6-1, 6-3. David Ferrer and Jo-Wilfried Tsonga both advanced with quick victories over their opponents. Juan Martin del Potro took down Marina Matosevic in straight sets 7-5, 6-2 and Janko Tipsarevic won 6-4, 6-2 over Gilles Muller.