Sergei Bubka says he will undertake a "complete review" of track and field if elected president of the International Association of Athletics Federations.

The Ukrainian pole vault great on Thursday announced some elements of his campaign manifesto, which he calls "Vision 2025."

Rio de Janeiro's mayor has dismissed reports that layoffs of construction workers at one of the main 2016 Olympic sites could result in potentially damaging delays.

At a hastily called news conference at Deodoro, where 11 Olympic sports will be staged, Eduardo Paes said on Thursday the layoffs by construction company Queiroz Galvao were part of an ill-advised strategy to strong-arm the city council into making quicker payments for the $205 million project.

The previous two matchups between Serena Williams and Simona Halep were blowouts.

This one was a thriller.

What a shame that Formula One's next stop is China. Because its notoriously protest-intolerant government surely wouldn't look kindly on crowds of demonstrators venting against Bernie Ecclestone's latest putdown of women drivers.

Yet people should vent. Because there's a whiff of sexual apartheid in the latest madcap suggestion from F1's billionaire boss that teams should launch a championship exclusively for women.

Formula One great Jackie Stewart has bemoaned the downfall of the German Grand Prix and is urging the sport's bosses not to forsake tradition for money as the number of European races on the calendar dwindles.

The German GP was erased from the 2015 schedule because of financial problems and F1 commercial head Bernie Ecclestone hasn't guaranteed the future of the iconic Italian Grand Prix, either.

Liverpool forward Raheem Sterling is putting off contract talks with the club until the end of the season, saying "it has never been about money."

Liverpool manager Brendan Rodgers has said the 20-year-old Sterling, one of English football's top young talents, has been made an "incredible offer."

Los Angeles' Chris Paul had a season-high 41 points and 17 assists to lead the Clippers to a come-from-behind 126-122 win at Portland on Wednesday, denying the Trail Blazers a win that would have clinched the NBA's Northwest Division title.

Portland, which had won its previous four games, will have to wait to clinch their first division title in five years. The Blazers remained 6-1/2 games clear of Oklahoma City, which failed to make up ground after suffering a home defeat against Dallas in an even higher-scoring game.

Serena Williams marked another milestone Wednesday, punching her semi-final ticket at the Miami Masters with her 700th career match win, a 7-6 (7/4), 1-6, 6-3 triumph over Sabine Lisicki.

Williams will face a familiar foe for a place in the final, taking on popular Romanian Simona Halep, a 6-1, 7-5 winner over Sloane Stephens.

Before the first set ended Tuesday, Novak Djokovic had busted a racket in anger, drawn jeers from the crowd and received two code violations, which cost him a point penalty.

There were no further outbursts, and as Djokovic's play improved, so did his mood. He rallied from a break down in the second set and beat Alexandr Dolgopolov 6-7 (3), 7-5, 6-0 in the fourth round of the Miami Open.

Climbers are returning to Mount Everest as the climbing industry recovers from last year's deadly disaster on the world's highest peak, a Nepalese mountaineering official said Wednesday.

Climbers from four teams have already been issued permits allowing them to climb the 8,850-meter (29,035-foot) peak, another 11 written applications are pending and more applications are expected in the next few days, said Gyanendra Shrestha, an official at Nepal's Mountaineering Department.