Stan Wawrinka joined the elite band of players who have won more than one Grand Slam title in Paris on Sunday, but he still believes he does not belong in the current top bracket.

That is the reserve of the so-called "Big Four" of men's tennis comprising Roger Federer (17 Grand Slam titles, Rafael Nadal (14), Novak Djokovic (8) and Andy Murray (2), he said after defeating Djokovic in four sets in a superb French Open final.

Russia and Qatar could lose the 2018 and 2022 World Cups if irregularities are proven in them being awarded the hosting rights, a FIFA official told a Swiss newspaper published Sunday.

"If evidence exists that Qatar and Russia received the (World Cup) awards only thanks to bribes, then the awards could be annulled," head of FIFA's auditing and compliance committee Domenico Scala told the Sonntagszeitung weekly.

A moment of brilliance from Lieke Martens gave the Netherlands' their first women's World Cup goal in a 1-0 win over New Zealand on the opening day of the 2015 tournament in Canada on Saturday.

Martens, who plays club football in Sweden, scored the 21st goal of her international career with a superb 33-minute strike from outside the area.

New Zealand's Scott Dixon earned his second victory of the IndyCar season on Saturday, a commanding win in a fast-paced race at the Texas Motor Speedway.

The Target Chip Ganassi team driver led 97 of the 248 laps to beat team-mate Tony Kanaan of Brazil by 7.8 seconds.

Luis Suarez and Neymar scored second-half goals to give Barcelona a 3-1 Champions League final victory over Juventus on Saturday as the Spaniards became the first team to twice win the European treble.

Luis Enrique capped his first season as Barcelona's head coach by matching Pep Guardiola's feat from the 2008/09 season when the Catalans captured the European, Spanish league and cup titles.

Dozens of demonstrators gathered Saturday at Rio de Janeiro's heavily polluted Guanabara Bay, demanding that officials clean it up before it is used as a 2016 Olympic sailing venue.

Amid whistles of disapproval and shouts of "shame!" demonstrators held a beachside protest, their boats symbolically kept on the shore as they waved their oars in the air.

When Luis Enrique was hired as Barcelona boss just over a year ago his challenge was a daunting one; to bring back the glory years of Pep Guardiola.

Fast-forward 12 months and Enrique has not for the first time in his career followed in Guardiola's footsteps by landing the treble: Saturday's 3-1 defeat of Juventus added the Champions League to La Liga and Copa del Rey triumphs.

Juventus goalkeeper Gianluigi Buffon said he is ready to keep playing for another three seasons to achieve some "dreams" even though he will then be past 40.

Buffon suffered his second Champions League final defeat with Juventus in their 3-1 slump to Barcelona on Saturday.

LeBron James takes inspiration from those dismissing the Cleveland Cavaliers' championship hopes after losing Kyrie Irving, while the Golden State Warriors are wary of overconfidence in the NBA Finals.

All-Star guard Irving underwent surgery Saturday to repair the left kneecap he fractured in a 108-100 loss to Golden State in Thursday's opener of the best-of-seven series.

Serena Williams won her 20th Grand Slam title and third French Open crown at Roland Garros on Saturday, clawing her way back from a break down in the last set to defeat Lucie Safarova 6-3, 6-7 (2/7), 6-2.

It what was a disjointed affair, the 33-year-old American was coasting to a straight-sets win, a set and 4-1 up against the Czech 13th seed, playing in her first Grand Slam final at the age of 28.