Graeme McDowell and Scotland's Russell Knox were in a share of the final-round lead in the OHL Classic at Mayakoba in Mexico on Sunday before play was suspended due to darkness.

McDowell, chasing his first PGA Tour victory since April 2013, was six-under for the round after 13 holes at the El Camaleon Golf Club in Playa del Carmen while Knox, who won last week’s WGC-HSBC Champions event, was six-under after 12 holes.

The final round, which will resume Monday at 8 a.m. ET (1300 GMT), was interrupted by inclement weather and the nearly four-hour delay prevented all but 27 players from finishing their rounds.

McDowell, who started the day three shots behind overnight leader Derek Fathauer, picked up three strokes with a string of birdies starting at the par-five fifth hole.

The 2010 US Open champion maintained that form on the back nine where he birdied the 10th, 12th and 13th holes before being forced off the course with a 19-under total of 200.

Knox, who triumphed in his World Golf Championship debut in Shanghai, was red-hot on the front nine where he made four consecutive birdies from the par-four third hole before picking up another shot at the eighth and 11th holes.

American Jason Bohn was two shots behind the leaders with six holes to play while compatriot Fathauer was at 15-under for the tournament with six holes to play.