Melbourne, AUSTRALIA -- The first week of the Australian Open seemed pretty straightforward for a while (aside from the weather, of course). Through the third round, the top four men's and women's seeds were still alive.
However, Week 1 closed out with a major upset: No. 14 Ana Ivanovic upended the seemingly unbeatable Serena Williams in the fourth round.
Victoria Azarenka: When rackets attack! (Paul Crock/AFP/Getty Images)
Gael Monfils: Making tennis photos look like optical illusions since 2004. (Michael Dodge/Getty Images)
David Ferrer: Your mustache is growing in funny, David. (William West/AFP/Getty Images)
Roberto Bautista Agut: The man who knocked out Juan Martin del Potro is hungry for more. (Greg Wood/AFP/Getty Images)
Andy Murray fans: So that explains the heat wave. (Mal Fairclough/AFP/Getty Images)
Jerzy Janowicz: Rage, disappointment or pure unadulterated bliss, Janowicz always delivers on emotions. (Vince Caligiuri/Getty Images)
Fabio Fognini: Fabio lives life. Deal with it. (Vince Caligiuri/Getty Images)
Agnieszka Radwanska: The Ninja prepares to strike. (Cameron Spencer/Getty Images)
Bernard Tomic: The tennis court is a lonely place to be when even your home crowd is booing you. (Scott Barbour/Getty Images)
Benoit Paire: Benoit cares not for your "changeovers." He will sit when and where he wants to sit. (Scott Barbour/Getty Images)
Angelique Kerber: The future's so bright, she's gotta wear -- oh, never mind. Kerber was upset by No. 29 Flavia Pennetta in the fourth round. (Graham Denholm/Getty Images)
Anastasia Pavlyuchenkova: Homeland