Singh is third on the PGA money list this year

Singh, third on the PGA money list this year, and Lewis were at 12 under after completing the rain-delayed third round and five holes of the final round, which will resume on Monday morning.

A dozen players were within five shots of the lead when play was halted by darkness at the Tournament Players Club at Deere Run, where heavy rains washed out Saturday's round.

Lewis, who has topped the leaderboard throughout the tournament which he won in 1999, could not add to the 12-under total he built with 65s in the first two rounds.

He said a north wind and slow putting surface offset rain-softened greens and fairways. He predicted a score of 4 under might be needed to win on Monday.

"If it stays calm, there'll be some birdies made," Lewis said.

Singh, who started the day four shots back, picked up two strokes with three birdies and a bogey during the third round, then birdied two of five holes in the final round before play was stopped.

He is playing for the seventh straight week in an attempt to win the money title.

Notah Begay III, Chris Riley and Paul Stankowski were one shot back at 11 under, while Jonathan Byrd was alone in sixth place at 10 under.

Three players were within three shots at 9 under.