Munoz maintains Greenbrier golf lead

US PGA Tour rookie Sebastian Munoz has a two-shot lead after three rounds of the Greenbrier Classic in West Virginia.

Sebastian Munoz shot a two-under 68 to maintain a two-stroke lead at the Greenbrier Classic. (AAP)

Colombian golfer Sebastian Munoz has maintained a two-shot lead going into the final round of the US PGA Tour's Greenbrier Classic.

The 24-year-old Tour rookie shot a two-under 68 on Saturday to stay in control of the tournament in West Virginia as he looks to become the event's first wire-to-wire winner.

He sits on 14-under 196, with American Robert Streb his nearest rival after he fired a terrific five-under 65 at Old White TPC.

American rookie Xander Schauffele and compatriot Jamie Lovemark were 11 under after 66s.

Veteran Davis Love III was at 10 under after a 68.

At 53, he's trying to become the oldest winner on the PGA Tour.

Kelly Kraft (67) and Russell Henley (68) also were 10 under.

Curtis Luck is the best-placed Australian in a tie for 20th at four under after a 68.