Roger Federer says Wimbledon's tighter enforcement of its all-white clothing policy for players is "too strict."

There have been complaints this year from some players over the more stringent regulations that include undergarments, the amount of colored trim on shirts and shorts and headbands and wristbands.

Ghana coach Kwesi Appiah will not call up Kevin-Prince Boateng in the future after their World Cup bust-up.

Back home after Ghana's elimination, Appiah said Wednesday he will now only select players who are "disciplined, committed and ready to die for the country."

Andy Murray's reign as Wimbledon champion came to a stunning end as Bulgaria's Grigor Dimitrov clinched a sensational 6-1, 7-6 (7/4), 6-2 victory in the quarterfinals on Wednesday.

Murray had hoped to become the first British man to successfully defend the Wimbledon title since Fred Perry in 1936, but the Scot was completely out-classed in a two-hour masterclass from 11th seed Dimitrov on Centre Court.

Eugenie Bouchard moved a step closer to being crowned the queen of Wimbledon as the Canadian glamor girl booked a semifinal showdown with Simona Halep on Wednesday.

Bouchard's royalty-obsessed mother named the 20-year-old after the younger daughter of Prince Andrew, Queen Elizabeth II's second son, while her sister is named after Beatrice, Andrew's elder daughter.

A free kick that provided one of the most comical moments of the World Cup when Germany's Thomas Mueller stumbled before stepping over the ball was a rehearsed trick that went wrong.

Germany earned a free kick in the 88th minute of second-round match against Algeria on Monday.

Serena Williams said she was "heartbroken" by having to retire from her Wimbledon doubles with sister Venus because of a viral illness which saw her close to fainting and in tears.

Serena, the 32-year-old world number one singles player, called the doctor to Court One just after she and Venus had warmed up for their second round match against Kristina Barrois and Stefanie Voegele.

Extra time goals from Kevin de Bruyne and Romelu Lukaku sent Belgium into the World Cup quarter-finals for first time in 28 years with a 2-1 win over the United States on Tuesday.

American keeper Tim Howard had made a string of fine saves to keep Marc Wilmots' men at bay during the 90 minutes in Salvador.

Angel Di Maria scored in the 118th minute Tuesday to give Argentina a 1-0 win over Switzerland after extra time and a spot in the World Cup quarterfinals.

With a penalty shootout looming, Lionel Messi made a surging run toward the Swiss area and laid the ball off to Di Maria on the right, and the winger sent a left-foot shot past diving goalkeeper Diego Benaglio.

Australia's world number 144 Nick Kyrgios caused one of the greatest Wimbledon sensations on Tuesday when he sent world number one and 14-time Grand Slam title winner Rafael Nadal crashing to a shock fourth round defeat.

The 19-year-old Kyrgios, making his Wimbledon debut, clinched a fearless 7-6 (7/5), 5-7, 7-6 (7/5), 6-3 victory to become the first wildcard in 10 years to make the quarter-finals at the All England Club.

Nigeria coach Stephen Keshi has confirmed he has quit the Super Eagles in the wake of Monday's World Cup last 16 loss to France.

"Friends, it has been a good run and I have enjoyed every moment. It's been an honor coaching the SuperEagles. It is however time to bow out," he posted on his official twitter page.