Croatia completed a stunning Davis Cup comeback from 2-0 down to beat the USA 3-2 Sunday and advance to the semi-finals where they will face France.

Kyle Edmund won his second singles rubber of the weekend to steer Davis Cup champions Great Britain past Serbia on Sunday and into a mouthwatering semi-final clash against Argentina.

Brazilian security forces conducted a simulated counterterrorism operation Saturday at a Rio de Janeiro train station ahead of the Summer Olympics, a day after security was beefed up following the truck attack in Nice.

Two people posing as violent extremists in a train parked at a platform set off an explosion and then fired a series of blank rounds. A dozen soldiers quickly arrived to begin containing the "attack."

Defending champions Great Britain, Argentina and France gatecrashed their hosts' Davis Cup parties to edge closer to the semi-finals on Saturday.

A North American-led campaign to ban Russia from the Rio de Janeiro Olympics has opened up an international divide on how to deal with the doping scandal engulfing Russia.

Portuguese Finance Minister Mario Centeno pinned his colors to the mast, donning a green and red scarf as his countrymen lifted the European Championship trophy.

Brazil's interim president will hold an emergency meeting with cabinet ministers Friday to bolster security for next month's Olympics, officials said after a suspected terrorist attack in the French city of Nice.

"We think we will have to intensify the security monitoring system. We will have to increase the number of checkpoints and controls," Defense Minister Raul Jungmann told TV station Globo.

Barcelona star Neymar was as expected named in the Brazil squad for the Olympics football tournament on Thursday as well Paris Saint Germain defender Marquinhos.

Pop superstar Katy Perry re-emerged Friday after a quiet spell with a song of unity as part of the television coverage of the 2016 Rio Olympics.

The singer -- one of the most successful artists of her generation -- offered her first new music since her blockbuster 2013 album "Prism" with the song "Rise."

France Davis Cup captain Yannick Noah, riders at the Tour de France and golfers at the British Open led tributes Friday from the world of sport to the victims of the Nice terror attack.