Graeme McDowell is three strokes off the lead at the OHL Classic as the Northern Irishman gears up for a final-day charge in Mexico.
American journeyman Derek Fathauer played flawless golf to grab the first 54-hole lead of his PGA Tour career at Mayakoba on Saturday.
The 29-year-old carded a bogey-free, five-under 66 at the El Camaleon Golf Club in Playa del Carmen to move one shot ahead of compatriot Jason Bohn (65).
However overnight leader McDowell (70) and former British Open champion Justin Leonard (67) were among a group of four players just three strokes off the lead.
Fathauer, trying to become the sixth consecutive first-time winner on the PGA Tour, birdied the third, fifth, seventh and ninth holes to reach the turn with a two-stroke lead.
He then reached five-under for the day after a birdie at the par-five 13th. McDowell, fresh off an eight-under 63 in the second round, made a poor start as he followed a double-bogey at the opening hole with a bogey at the second.
But he recovered nicely with four birdies over a seven-hole stretch before bogeying the par-five 13th. The 2010 US Open champion then birdied his penultimate hole to put himself in contention for his first PGA Tour win since 2013.
Bohn was cruising along with four birdies on his front nine and then followed a birdie at the 12th with an eagle at the par-five 13th before a lightning delay halted play for about 90 minutes.
He would have had a share of the lead going into the final round if not for a bogey at the 18th.
