Michael Brennan was disqualified by the PGA Tour at the Farmers Insurance Open due to a controversial rule violation after round one.
Disqualification After Round One on the PGA Tour
In a stunning development at the Farmers Insurance Open, Michael Brennan was disqualified following the first round. The PGA Tour confirmed that Brennan breached the so-called Model Rule G-11 by using unauthorized material to analyze the greens. This constitutes a clear rules violation according to the Tour.
At the time of his disqualification, the 2025 Bank of Utah Championship winner was tied for 55th place at two under par.
What the ‘Model Rule G-11’ Permits and Prohibits
Effective since January 2022, this rule significantly restricts the use of analysis aids. Only PGA Tour-approved yardage books, official information on pin positions, and a course overview in a maximum DIN A4 size are permitted.
Handwritten notes may be made solely by the player or their caddie based on their own observations, such as the path of played or rolled balls and subjective impressions of the putting green. Detailed measurements or third-party green analyses are explicitly forbidden.
The rule stipulates a penalty of two strokes for a first offense, with disqualification ensuing after a second violation. The PGA Tour has not disclosed when Brennan’s infractions occurred.
A Rule Sparking Debate
The Model Rule G-11 has prompted discussion since its introduction. In 2022, Rory McIlroy, then president of the players’ council, defended the rule vigorously, stating many players had grown complacent in reading greens. “It’s not a huge advantage,” McIlroy said, “but it takes away a skill that requires time and practice. Reading greens is an art, and these aids negate individual strengths and advantages.”
Alex Cejka also faced disqualification in 2022 under this rule for using an unauthorized yardage book.
Hole locations for the third round of the Farmers Insurance Open pic.twitter.com/P4L6jEz39B
— PGA TOUR Communications (@PGATOURComms) January 31, 2026