Persistent heavy rain left standing water on a number of greens across Sunningdale, leading to tournament officials calling a halt to the second round just before 1pm.??
Bernhard Langer and Miguel Angel Jimenez, part of an eight-way tie for the lead after the opening day, have yet to start their second rounds, with 47 players still waiting to tee off.??
Overnight joint-leader Lianwei Zhang, the first Chinese player to ever appear in the tournament, moved in to the outright lead with a birdie at the first, but lost ground with a double-bogey six at the next and is one over for the day through 11.??
Montgomerie, resuming two shots off the pace after an opening-round 67, birdied three of the first five holes to move in to the outright lead but slipped back to five under after blemishes at the tenth and 12th.??
Bart Bryant opened with back-to-back pars to stay in the tie at the top of the leaderboard, while Ian Woosnam is back within two of the leaders after opening his round with an eagle at the par-five first.??
The chance of the second round being completed on Friday appears unlikely, with rain forecast for the remainder of the day.