The Open 2015: Dustin Johnson moves into lead after day two

American Dustin Johnson leads The Open on 10 under par, but he has not yet completed his second round at a rain-affected St Andrews.

The runner-up at last month's US Open made four birdies in his opening 10 holes, but his first bogey of the tournament on the 11th meant a one-shot overnight lead.

Johnson and other late starters who were delayed by a waterlogged course will resume their second round at 07:00 BST on Saturday.