The German golfer Alex Cejka fired a five-under-par 67 to lead by two shots from Britain's Ian Poulter after the second round of the Players Championship.
World number one Tiger Woods was seven shots off the lead after producing a three-under 69.
Cejka, 38, posted 13 birdies in his two rounds and is halfway toward the tournament record of 26 set by Fuzzy Zoeller in 1994.
Cejka has yet to win on the PGA Tour but was in contention at the Players four years ago when he was one stroke off the lead with four holes to go before fading to finish 12th.
Poulter's four-under 68, to follow his 67 from the first round, leaves him in a strong position for the weekend, two strokes clear of six players four shots off the lead.
Swede Henrik Stenson and U.S. Masters champion Angel Cabrera (65) were among those sharing third place. .
World number two Phil Mickelson shot 71 for 144 -- level par -- to just avoid the cut.