Ernie Els recovers from a poor opening round to shoot a four-under second round of 68 and he moves up the leaderboard to one under for the tournament
After a disappointing opening round of 76, South Africa's Tim Clark is one of the big early movers in the second round after going around in 68 for a level-par halfway total
Phil Mickelson finds the going tough for the second day at Hazeltine and finishes with a second consecutive round of 74 to be four over and in danger of missing the cut
Ian Poulter, who started the day on level par, reaches three under before dropping back and eventually finishes with a 70 for a two-under total
Fiji's Vijay Singh, the winner in 1998 and 2004, is among the early starters and the 46-year-old cards a level-par 72 to end up in share of second at three under
Padraig Harrington joins partner Tiger Woods in the lead early on but fades mid round to also end in a tie for second at three under
Ross Fisher launches a stunning charge and is six under for the day and tied with Tiger Woods for the lead at five under after 16 holes before ending with two bogeys for three under
Lee Westwood also gets going midway through his round but a double bogey on 17 derails his challenge and he ends on two under
Tiger Woods is joined in the lead by Ross Fisher, Padraig Harrington, Graeme McDowell and Alvaro Quiros at various stages but he fends them all off to lead by four at halfway
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