Andy Murray reaches third round of US Open

Defending champion Andy Murray has beaten Argentina's Leonardo Mayer to reach the third round of the US Open in four sets.

Andy Murray at the US Open in 2011. Credit: Elizabeth Pantaleo/PA Wire

Murray, seeded third, dropped his first set of the tournament as he came through 7-5 6-1 3-6 6-1 in two hours and 41 minutes.

He will face Germany's Florian Mayer, the world number 47, in the last 32 on Sunday.