Second Round of the Shell Houston Open

1 of 6 David J. Phillip/AP
Second Round of the Shell Houston OpenJohnson Wagner leads by three shots heading into the weekend.
2 of 6 Dave Einsel/AP
Defending champion Adam Scott tumbled down the leaderboard after a bogey-double bogey finish.
3 of 6 Marc Feldman/Getty Images
After making five bogeys on Thursday, K.J. Choi made zero Friday on his way to a six-under 66.
4 of 6 Marc Feldman/Getty Images
Geoff Ogilvy was near the lead during his second round, but five bogeys left him with a 73.
5 of 6 David J. Phillip/AP
Charley Hoffman shot a two-under 70, and he is in a tie for second.
6 of 6 David J. Phillip/AP
Mathew Goggin is tied with Hoffman after an eight-under 64.