Henrik Stenson retained a share of the lead at the halfway stage of the Arnold Palmer Invitational as Tiger Woods endured a tough second day at Bay Hill.
Stenson kept a bogey off his card and made three birdies in a solid 69 that kept him at the top of the leaderboard on 11 under, where he was later joined by Bryson DeChambeau after he carded a 66.
Rory McIlroy was again inconsistent as he fired a five-birdie 70 which leaves him six off the lead going into the weekend, while Woods is a further shot off the pace after recovering from a two-over front nine with an error-free back-nine 34 to salvage a 72.
Stenson was among the early starters as he looked to build on his superb opening 64, but the Swede failed replicate his putting form of day one and, after starting at the 10th, he carded 13 consecutive pars.
But he broke the run with an excellent approach to four feet at the fifth which he converted for the first of three straight birdies, the last of which came via a well-judged 20-foot putt from the fringe at the seventh.
Two more pars saw Stenson complete 36 holes with just one bogey on his card, and he will go out last with DeChambeau on Saturday after the American raced into a share of the lead with an eagle at 16 followed by his sixth birdie of the day at the last.
Talor Gooch is alone in third after he recovered from a bogey-bogey start with five birdies in seven holes after the turn, although he dropped another shot at 18 to slip to nine under.
Former BMW PGA champion Byung-hun An is one further back as he matched his opening 68, while tournament co-host Rickie Fowler (71) is among six players on six under.
McIlroy will look to put early pressure on the leaders on Saturday after again being unable to keep mistakes off his card following a bright start, teeing off at the 10th and picking up birdies at 13 and 15 although he missed out on both par-fives on the back nine.
The 28-year-old gave both shots back as errant tee shots at the first and second led to bogeys, but he responded with three consecutive birdies from the fourth before blotting his card for the third time when he found water with his approach to the eighth.
Woods bogeyed the first after pulling a long-iron into trouble on the left which set the tone for a wayward front nine, which could have been worse had he not enjoyed a huge slice of fortune at the fourth when his wild drive rebounded back into play off the out-of-bounds fence.
The eight-time champion three-putted the ninth to turn in 38, but he dug deep after the turn and picked up birdies at each of the par-fives - the 12th and 16th - to haul himself back to four under for the tournament.
Woods is now tied for 17th with defending champion Marc Leishman and Bubba Watson, who both fired 70s, while Justin Rose is also seven behind the leaders after a mixed-bag of a 71 in which he offset five bogeys with six birdies and carded only two pars over the last 10 holes.
Meanwhile, Danny Willett suffered another injury setback less than three weeks before the Masters as he was forced to withdraw after playing only four holes of his second round due to a shoulder problem.