Three-time major winner Singh carded four late birdies to shoot an opening round 63 and lead by one shot from Americans Jeff Maggert, Jonathan Byrd and Martin Flores.

CNN: Woods off the pace at Greenbrier as Singh takes lead

Quail Hollow champion Rickie Fowler also shot 69 to be third on five-under 211, one ahead of Woods, while Japan's Ryo Ishikawa was tied for fifth on 213 with Sweden's Henrik Stenson and American Jonathan Byrd.

CNN: Late lapses cost Tiger at Memorial