Two serving Metropolitan police officers and one retired officer have been arrested on suspicion of perverting the course of justice over evidence given at the inquest of Sean Rigg, who died at Brixton police station in August 2008, the Independent Police Complaints Commission said.
More top news
World Number 4 Murray has won their previous five encounters, but Karlovic tops the tournament's aces leaderboard so far.
The Britain's Got Talent judge was accused of singing the national anthem in an American accent and getting the words wrong.
Greece's controversial Finance Minister Yanis Varoufakis has released a defiant statement of resignation entitled 'Minister no more!'