Vijay Singh, Brendan Jones and Lucas Glover set the second round clubhouse target at the US PGA Championship but out on the course Tiger Woods and Padraig Harrington were still out in front at Hazeltine National Golf Club.
Woods held a one-shot overnight lead over playing partner and defending champion Harrington, having shot a five under par 67 for his opening round at the 7,674 yard Minnesota course.
But a bogey at the first saw the World Number One join Harrington on four under through the first two holes as they began their afternoon battle.
Two-time winner Singh was a further stroke behind at three under in a group tied for third, having signed for a second round 72.
Fijian Singh, who has missed three cuts in a row at the US PGA having won it in 1998 and 2004, got off to an ideal start with a birdie at the par four tenth.
He then bogeyed his third hole of the day before bouncing back with another birdie at his ninth, the 475 yard uphill par four 18th, to return to four under.
Singh returned to three under with a bogey at the second and with three holes to play remained two shots behind Woods.
Singh's rollercoaster round continued with a birdie at his 16th hole of the day to return to four under par, but the Fijian, last year's FedEx Cup winner, then bogeyed the ninth, his last hole, to post a level 72.
That left him on three under par at the midway point of the tournament.
US Open Championship winner Glover, also playing the back nine first, joined the group at three under, thanks to birdies at the 14th and par five 15th, the longest hole on the course at 642 yards.
Australian Jones, a Japan Tour regular, eagled the par four 14th to jump to three under with four to play, while Denmark's Søren Kjeldsen recovered from a double bogey six at the second with three birdies to get to the same score after 14.
Glover remained at three under after 13, with Robert Allenby, joint runner-up with Harrington last week, his fellow Australian Mathew Goggin, Alvaro Quiros of Spain and American Hunter Mahan all set to start from the same score.
Australian Jones closed out a round of 70 to join Singh and Glover, who finished at three under after shooting a 69, bouncing back from a bogey at the third after making the turn at two under with birdies at the fourth and seventh.