America's Jim Furyk, Ricky Fowler and Steve Stricker are currently tied for ninth at two-under par alongside England's Lee Westwood and two-time champion, Germany's Bernhard Langer.
Tiger Woods and Steve Stricker, who won four points out of four in the Presidents Cup last year, were together for the second day running, playing with 21-year-old Rickie Fowler and Jim Furyk.
Other pairings included Masters champion and world number two Phil Mickelson with Rickie Fowler, the youngest player in the US team at 21, Jim Furyk and Jeff Overton, Stewart Cink and Matt Kuchar and Bubba Watson and Dustin Johnson.