Jordan Spieth is leading after the second round of the Hero World Challenge after firing a six-under par 66 on Friday. Speth finished 36 holes on 11-under 133 at the Albany resort near Nassau, Bahamas. The reigning Masters and US Open champion joins fellow Americans Bill Haas and Jimmy Walker atop the leaderboard in the 18-man invitational event hosted by Tiger Woods. Americans Patrick Reed and Chris Kirk share fourth with Bubba Watson on 134 with England's Paul Casey and Americans Zach Johnson and Matt Kuchar sharing seventh on 136.