defending champion

Britain's Andy Murray takes on top seed and defending champion Novak Djokovic in the semi-finals of the Australian Open.

Defending champion Kim Clijsters, playing in her last Australian Open, takes on Belarus's Victoria Azarenka before Maria Sharapova and Petra Kvitova meet in the other women's semi-final.

Number one-ranked Caroline Wozniacki takes on defending champion Kim Clijsters for a place in the Australian Open semi-finals.

Down four match points and hobbling on an injured left ankle, defending champion Kim Clijsters somehow rallied for a dramatic 4-6, 7-6 , 6-4 win over Li Na at the Australian Open on Sunday.

Henrik Sedin broke a tie with the third of Vancouver's four power-play goals and the Canucks beat the defending champion Boston Bruins 4-3 on Saturday in the first game between the teams since the Stanley Cup finals.

Defending champion Roger Federer maintained his perfect record at the Barclays ATP World Tour Finals this year with a 6-1 3-6 6-3 victory over Mardy Fish at the O2 Arena.

Defending champion Roger Federer has been drawn with longtime rival Rafael Nadal in the group stages of the ATP World Tour Finals in London next week.

Returning brilliantly, swatting winners from all angles, the No. 1-ranked Djokovic held on to beat defending champion Rafael Nadal 6-2, 6-4, 6-7 , 6-1 on Monday night in a final chock-full of lengthy, mesmerizing points to earn his first U.S.

Open title and third Grand Slam trophy of 2011.

Novak Djokovic beats defending champion Rafael Nadal in an epic final to win his first US Open and third Grand Slam title of 2011.

World number one Novak Djokovic takes on defending champion Rafael Nadal in the US Open final at Flushing Meadows.