Las Vegas: PGA Tour rookie Brett Stegmaier vaulted into the lead when play was suspended in fading light late in the second round at the Shriners Hospitals for Children Open in Las Vegas on Friday.
Stegmaier upstaged his better-known rivals to pick up six shots in 15 holes at TPC Summerlin in the Nevada desert.
The 32-year-old from Connecticut, in only his fifth start on tour, was among 14 players unable to finish before darkness.
Stegmaeir, on 11-under, heads fellow Americans Chad Campbell (67), Morgan Hoffman (66) and Tyler Aldridge (68) by one stroke.
Aldridge, a journeyman who has played most of his competitive golf on satellite tours in the United States and Canada, nearly holed out with his second shot at the par-four 18th, tapping in from six inches for his third birdie in the final four holes.
American world number five Rickie Fowler, the highest-ranked player in the field, opened with a one-over 72 on Thursday, but bounced back with a 65 that featured an 80-foot putt for eagle at the 13th to move within six shots of the lead.