Laura Robson speechless after doubles win

Laura Robson struggled to find words after she and partner Andy Murray booked their place in Sunday's mixed doubles final at the Olympics.

The British duo narrowly defeated Sabine Lisicki and Christopher Kas of Germany at Wimbledon on Saturday to guarantee themselves at least a silver medal in the event.

"Olympic final tomorrow. Can't even explain how happy I am right now," Robson tweeted.

It is the first time since 1924 that mixed doubles have been included in an Olympic schedule.