Japanese tennis star Kei Nishikori has enlisted the help of Michael Chang as he looks to break into the top 10 in 2014.

Chang will join Nishikori's coaching staff for 17-20 weeks in 2014, Nishikori's management team announced on Wednesday.

Germany defender Jerome Boateng has extended his contract with Bayern Munich in a deal that will keep him at the Champions League titleholder through mid-2018.

The Bundesliga champion's chairman, Karl-Heinz Rummenigge, said Boateng has become one of the club's "important players" and that it was only "logical" for Bayern to seek to keep him.

Indiana showed it is a legitimate challenger to Miami for the NBA Eastern Conference crown by beating the Heat 90-84 on Tuesday, pulling off an impressive second-half rally in a clash of the East's top two teams.

Among the day's other games, Oklahoma City made it 11 wins from 12 games by beating Atlanta, San Antonio recovered from a big early deficit to run down Toronto, and Phoenix was too good for the Los Angeles Lakers even with Kobe Bryant getting back near his old self.

It's a good thing the mayor of World Cup city Manaus has a sense of humor. Because some of the stuff being said of late about this historic city deep in the heart of the Amazon jungle is laughable.

Last week, it was England coach Roy Hodgson, expressing misgivings about the city's taxing high heat and humidity.

Indian athletes have been cleared to compete in the Winter Games in Sochi after the country complied with the IOC's ethics rules and avoided becoming the first country expelled from the Olympics in more than 40 years.

Still to be determined is whether the few Indian athletes who have qualified for Sochi compete for their country or under the Olympic flag.

Olympiakos and Bayer Leverkusen reached the last 16 of the Champions League on Tuesday, with either Juventus or Galatasaray set to join them after their match in Istanbul was abandoned because of a snowstorm.

Match officials stopped play after 31 minutes, ruling the field was too dangerous to play on. The last hour will now be played on Wednesday, kicking off at 3pm local time (1300 GMT).

The Champions League match between Galatasaray and Juventus was abandoned due to poor weather on Tuesday with the remaining 59 minutes to be played on Wednesday.

Play was halted in the 31st minute with the score at 0-0 as hail and snow began to fall heavily in Istanbul.

Evan Lysacek will not defend his Olympic figure skating title in Sochi because of a torn labrum in his left hip.

After two months of aggressive treatment, doctors told Lysacek last week the injury was not going to improve and he was risking permanent damage if he kept training.

Borussia Dortmund needs to beat Marseille to be sure of advancing from Group F of the Champions League.

A draw would be enough if Napoli fails to win at home against group leader Arsenal.

Kemba Walker scored 27 of his 31 points in the second half as the Charlotte Bobcats overcame Stephen Curry's 43 points to beat the Golden State Warriors 115-111 on Monday night.

Playing in front of his hometown crowd, Curry scored 19 points in the fourth quarter to cut the Bobcats' lead to 111-109 with 11 seconds left. But the Warriors couldn't contain Walker, and the point guard hit four free throws in the final 11 seconds to seal the victory.