Serena Williams started the year with high expectations after finishing the 2012 season strongly.
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Victoria Azarenka started the year as the world no. 1 and played her first tournament in Brisbane where she withdrew before her semifinals match against Serena Williams.
2011 ATP Challenger Tour | 2012 ATP Challenger Tour | 2013 ATP Challenger Tour | PGA Tour | ATP World Tour 250 series | 2013 | Tour de France | The Championships, Wimbledon | ATP World Tour 250 Series | 2013 ATP World Tour | 2013 Southeast Asian Games | 2012 ATP World Tour | 2001 ATP Tour | 2011 ATP World Tour | 2013 ITF Women's Circuit | World Figure Skating Championships | ATP World Tour 500 series | 2010 ATP World Tour | 2003 ATP Tour | Grand Tour | ATP World Tour Masters 1000 | 1996 ATP Tour | 2002 ATP Tour | WTA Tier III tournaments | WTA International tournaments | WTA Premier tournaments | 2013 WTA Tour | 2006 ATP Tour | ICF Canoe Sprint World Championships | 2013 Island Games |