Jamie Murray and Bethanie Mattek-Sands won a heated mixed doubles first-round match against Barbora Strycova and Marcelo Melo which featured a 10-minute delay over a disputed umpire's call.

Strycova called a decision "a joke" as the players argued in the second game of the match.

Murray and Mattek-Sands went on to win 3-6 6-4 10-7 against the top seeds.

In the men's doubles, Britain's Jonny O'Mara and Argentine Marcelo Arevalo are through to the quarter-finals.

They beat Australian seventh seeds John Peers and Michael Venus 6-4 7-6 (9-7).