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 shocking development at the Farmers Insurance Open, Michael Brennan was disqualified from the tournament after the first round. The PGA Tour confirmed a breach of the so-called Model Rule G-11. Brennan reportedly used unauthorized materials to analyze the greens, which the Tour views as a clear violation of the rules.
At the time of his disqualification, the 2025 Bank of Utah Championship winner was tied for 55th place, two strokes under par.
What Model Rule G-11 Allows and Prohibits
Effective since January 2022, this rule significantly limits the use of analytical aids. Only PGA Tour-approved yardage books, official information on pin positions, and a course overview limited to the size of an A4 sheet are permitted.
Handwritten notes may only be made by the player or their caddie and must be based on their own observations, such as watching balls roll or play, and subjective impressions of the putting green. Detailed measurements or analyses created by others are expressly forbidden.
The rule initially penalizes violations with two strokes, while a second offense results in disqualification. The PGA Tour has not yet disclosed when Brennan’s violations occurred.
A Rule That Sparks Debate
Model Rule G-11 has sparked debates since its inception. In 2022, Rory McIlroy, then-president of the Player Advisory Council, defended the rule strongly, stating many players had grown too reliant on reading aids. “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.”
German player Alex Cejka was also affected by this rule shortly after its introduction, having been disqualified in 2022 for using a non-approved yardage book.
Hole locations for the third round of the Farmers Insurance Open pic.twitter.com/P4L6jEz39B
— PGA TOUR Communications (@PGATOURComms) January 31, 2026