Coral Springs, FL (My Sportsbook) - John Morse struggled to a two-over 74 Thursday as his lead dropped to one stroke after three rounds of the Champions Tour National Qualifying Tournament.

Morse, who led by three shots after two rounds, finished 54 holes at six- under-par 210.

Robert Thompson carded a three-under 69 to move into second at minus-five.

Tom McKnight fired the low round of the week so far with his seven-under 65. That jumped him into a share of third place at four-under-par 212. He was joined there by Jay Don Blake (70).

Through three rounds, Blake is the only player to break par each round.

Morse, who has led since the second nine of the opening round, parred his first five holes. He moved to minus-nine with a birdie on the par-four sixth.

Around the turn at the TPC at Eagle Trace, Morse tripped to a bogey on the 11th. He fell to minus-six with a double-bogey at the 14th.

Morse slipped to another bogey at the 16th, but came right back with a birdie on 17 to remain atop the leaderboard after three rounds.

Thompson faltered to a bogey on the third, but rebounded with three birdies in a four-hole span from the fifth to move to minus-four. He tripped to a bogey at 13, but birdies at 15 and 17 got Thompson within one of the lead.

Ronnie Black (67), David Ogrin (70), James Mason (68) and Tim Conley (68) share fifth place at three-under-par 213. Mike San Filippo posted a 68 Thursday to move into ninth at minus-two.

Steve Thomas carded a five-under 67 to climb into 10th at one-under-par 215. Mark W. Johnson entered the day alone in second, but faltered to a five-over 77 that dropped him into 11th place at even-par.