The world No. 1 scorched venerable Seminole Golf Club on Monday to claim gross-division honors at the Seminole Pro-Member paired with John Pinkham.
McIlroy, who missed the cut in his 2015 debut on the PGA Tour with rounds of 73-74 last week at PGA National, began his day with three consecutive birdies and went out in 6-under 30. The Ulsterman shot 63 on his own ball.
Ben Martin paired with Rick Woolworth finished second in the gross division, two strokes behind McIlroy.
Phil Mickelson, who finished 17th earlier on Monday at the weather-delayed Honda Classic, tied for eighth place at Seminole with a team gross score of 67.
The event annually draws some of the game’s top players for an 18-hole pro-am on the Monday after the Honda Classic.