Farmingdale, New York  - The US Open will not finish until at least Monday after more heavy rain in the New York area forced another delay to play on Sunday.

Sixteen of the 60 remaining players have not even begun their third rounds and play on Sunday will not begin until 1200 local time, a delay of four and a half hours.

A deluge on day one set the tournament back and a Monday finish is now the earliest the tournament can be completed.

American Ricky Barnes heads the leaderboard on 8-under-par, one shot clear of compatriot Lucas Glover. Former Masters champion Mike Weir is a shot further back, while Swede Peter Hanson, former world No 1 David Duval and Japan's Azuma Yano are all 3-under.

Defending champion Tiger Woods is 3-over, 11 shots off the pace and needing something spectacular over the weekend if he is to win his 15th Major title. (dpa)