Features index

May 8, 2013: Victoria Azarenka issued a withering attack on umpire Mariana Alves as she slumped to a shock 1-6 6-2 6-3 second-round defeat by world No. 24 Ekaterina Makarova at the Mutua Madrid Open

Mar 23, 2013: Two-time champion Victoria Azarenka withdrew from the Sony Open before her opening match on Friday because of a lingering right ankle injury

Mar 14, 2013: Caroline Wozniacki and Angelique Kerber both reached the semi-finals of the BNP Paribas Open without playing a shot on Thursday, after both their opponents were forced to withdraw through injury

Mar 12, 2013: World No. 2 Victoria Azarenka continues to look shaky at the BNP Paribas Open, dropping a set before fighting back to reach the fourth round

Mar 10, 2013: Top seed and reigning champion Victoria Azarenka overcame a 4-1 deficit in the first set to beat two-time champion Daniela Hantuchova 6-4 6-1 in the second round of the BNP Paribas Open

Feb 23, 2013: When Victoria Azarenka, a fiery 19-year-old from Belarus, throttled Serena Williams in the 2009 Miami final, it looked like the makings of a new world order

Feb 19, 2013: Victoria Azarenka has withdrawn from the Dubai Duty Free Tennis Championships to recover from a bruised bone in her right foot

Feb 17, 2013: Victoria Azarenka marked the passing of her world No. 1 crown to Serena Williams by beating her to lift the Qatar Open title in Doha

Feb 16, 2013: Out-going world No. 1 Victoria Azarenka will have a chance to challenge the world ranking system after setting up a Qatar Open final with Serena Williams - the lady who will take her crown on Monday

Feb 15, 2013: On Monday Serena Williams will become the oldest world No. 1 in the female game since the introduction of computer rankings in 1975

Feb 15, 2013: Maria Sharapova is on course for a semi-final showdown with Serena Williams at the Qatar Open after she beat Sam Stosur on Friday

Feb 14, 2013: World No. 1 and defending champion Victoria Azarenka has reached the quarter-finals of the Qatar Total Open by dispatching Christina McHale 6-0 6-0

Jan 26, 2013: After succesfully defending her Australian Open title with victory over Li Na, Victoria Azarenka admitted she struggled mentally in the build-up to the final after a great deal of negative press in Melbourne

Jan 26, 2013: Victoria Azarenka successfully defended her Australian Open crown to retain the world No. 1 ranking with victory over Li Na

Jan 24, 2013: Victoria Azarenka powered her way into the final of the Australian Open by halting the brilliant run of United States teenager Sloane Stephens

Jan 21, 2013: Victoria Azarenka's imperious form at the Australian Open continued with a demolition of Elena Vesnina

Jan 19, 2013: Defending-champion Victoria Azarenka and five-time champion Serena Williams both secured their places in the fourth round of the Australian Open on day six, but in contrasting styles

Jan 17, 2013: Serena Williams and Victoria Azarenka breezed into the third round of the Australian Open with comfortable wins on Rod Laver Arena

Jan 13, 2013: Maria Sharapova has confessed her Australian Open preparations have been far from ideal, but remains confident she has the necessary experience to cope over the next two weeks