Williams was trailing Clijsters 4-6, 5-6 and serving at 15-30 when the baseline judge called a foot-fault on a second serve.

CNN: Serena handed suspended ban and fine

Despite failing to close out the set at 5-3, China's most-accomplished tennis player clinched her fourth set-point opportunity on Azarenka's serve, courtesy of a double fault.

WSJ: Azarenka Beats Li to Win Australian Open

Despite failing to close out the set at 5-3, China's most-accomplished tennis player clinched her fourth set-point opportunity on Ms. Azarenka's serve, courtesy of a double fault.

WSJ: Azarenka Beats Li to Win Australian Open

Murray took advantage of the lifeline with a Verdasco double-fault giving the Scot the chance to serve for the match, which he did thanks to another backhand error from the Spaniard.

BBC: Murray maintains winning sequence

On the double-fault, Murray had to stop as he was about to serve to pick up a feather that had fallen on the court.

NPR: Djokovic Beats Murray For 3rd Straight Aust. Title

He may have saved one break point on his serve but the pressure seemed to mount as he dished up a double-fault to lose the game.

BBC: Daniel Nestor & Nenad Zimonjic win ATP title in London

But Federer regained his composure in the the third and broke serve in the sixth game before closing out the match on a Coria double-fault.

BBC: SPORT | Tennis | Nalbandian claims semi-final spot

Serve was again key with the Thai player hitting four aces and just one double-fault while the German had just one ace and five double-faults.

BBC: Blake books final place

He actually looked up at Richard Ins (the chair umpire) and was like hey, the crowd's making a noise, can I hit a first serve, and Richard told him no, and he stepped up and threw the double, double fault.

CNN: June 8, 2012 -- Updated 1951 GMT (0351 HKT)