Torrential rain wiped out most play Friday at the Senior British Open with more than half the field still to start their second round.

Scotland's Colin Montgomerie is one of eight players on 5 under at the top of the leaderboard but five of them have yet to play a hole in the second round.

Two strokes behind overnight, Montgomerie birdied three of his first five holes to lead outright on 6 under. With increasing rain, he bogeyed No. 10, birdied the 11th and bogeyed the 12th to return to 5 under.

Among the leaders, China's Lianwei Zhang and American Bart Bryant had started their second rounds when play was suspended for the day at 3 p.m.

Zhang was 1 over after 11. Bryant parred the two holes he played.