Veteran Lleyton Hewitt is on standby to break his short-lived retirement if Australia need their new captain against the United States in this weekend's Davis Cup World Group tie in Melbourne.

World number 27 Nick Kyrgios withdrew before Thursday's draw with a virus and back trouble, with Hewitt, in charge as Australia captain for the first time, nominated as his replacement.

Kawhi Leonard tallied 27 points as the San Antonio Spurs clinched their 19th straight playoff berth and remained unbeaten at home with a 97-81 win over the Detroit Pistons on Wednesday.

The Spurs overcame a sloppy first half before running away with it in the second as they improved to 29-0 at home to stretch their record for the best home start by an NBA Western Conference team.

Belgium continue to hold off Argentina and Spain at the top of FIFA's latest world rankings released on Thursday.

World champions Germany sit fourth while Italy move up one rung to 14th above the Netherlands in the only movement in the top 20.

Pep Guardiola had good news hours before Bayern Munich's league match against Mainz on Wednesday as Spain international Javi Martinez trained with the ball for the first time since surgery.

The 27-year-old Martinez was at Bayern's Saebener Strasse training ground as his team-mates prepared for the game at Munich's Allianz Arena.

UEFA on Wednesday banned Turkish champions Galatasaray from European competitions for one year for breaching spending rules.

The UEFA club financial control adjudicatory chamber ordered the ban after Galatasaray "failed to comply with the terms of the settlement agreement" made with the European body in May 2014, said a statement.

Novak Djokovic, Usain Bolt and Lionel Messi are among the six nominations for the Laureus Awards in the category of Best Male Athlete of 2015, the foundation announced on Wednesday.

The 17th edition of the Laureus World Sports Awards, which honor the prowess of the planet's best sportsmen and women, will be held on April 16 in Berlin.

World Cup leader Lindsey Vonn announced on Wednesday that her season is over due to a knee injury sustained in a fall last weekend.

"Today I am making the difficult decision to end my season and leave the World Cup circuit due to an injury I suffered last Saturday," she wrote on her Facebook page.

Germany team manager Oliver Bierhoff has backed both captain Bastian Schweinsteiger and defender Jerome Boateng to recover from injury to play for the world champions in June's European championships.

"I am 100 percent convinced that Jerome will manage it. He's very professional," Bierhoff said at a panel discussion in Mainz on Tuesday.

Leicester's unlikely Premier League title challenge faltered with a 2-2 home draw with West Bromwich Albion on Tuesday, offering Tottenham the chance to go top in another twist to the most unpredictable race for the championship in years.

Moving three points clear of the world's richest league was nothing to celebrate for Leicester's despondent players, who wasted a slew of late chances to put a provisional five-point gap over Spurs.

Draymond Green hit an off-balance 3-pointer as the shot clock expired with 40.2 seconds remaining in overtime, and the Golden State Warriors escaped with a 109-105 win against the Atlanta Hawks on Tuesday while Stephen Curry watched in street clothes with an injured ankle.

Andrew Bogut saved the ball from going out of bounds, and then Green got the shot off just in time while avoiding Kent Bazemore's diving steal attempt.