Serena Williams and Andy Murray suffer exits in Miami Open

Serena Williams and Andy Murray were the big losers in the Miami Open as they were dumped out in the third and fourth round respectively on a day of upsets in Florida.

World number two Murray cut a disconsolate figure as he was beaten 6-7 (7/1) 6-4 6-3 by the impressive Grigor Dimitrov, who enjoyed a first win against a top-10 opponent in 13 matches.