Andy Murray gets walkover into Miami Masters final

Andy Murray is through to the final of the Miami Masters as Rafael Nadal has withdrawn from their semi-final with a knee injury.

The pair were expected to face each other on Friday evening.

World number two Nadal is reportedly suffering with a pain in his left knee.

"So sorry for my fans, those here at Miami and those around the world. My knee won't let me play today," Nadal tweeted.

It is the second walkover that Murray has received during the tournament, the first being due to Milos Raonic's third-round withdrawal.

The world number four will face either Novak Djokovic or Juan Monaco in Sunday's final.