Michael Brennan was disqualified by the PGA Tour at the Farmers Insurance Open due to a controversial rule, ending his run after round one.
Disqualification After Round One on the PGA Tour
In a shock development at the Farmers Insurance Open, Michael Brennan was disqualified following the first round. The PGA Tour confirmed a violation of the so-called Model Rule G-11. Brennan used unauthorized equipment to analyze the greens, which constitutes a clear breach of the rules according to the Tour.
At the time of disqualification, the 2025 Bank of Utah Championship winner was tied for 55th place at two under par.
What the Model Rule G-11 Allows and Prohibits
In effect since January 2022, the rule significantly restricts the use of analytical aids. Only PGA Tour-approved yardage books, official flagstick location data, and a course overview of a maximum DIN A4 size are permitted.
Handwritten notes may only be made by the player or their caddie based on their own observations, including ball rolls and subjective impressions of the putting greens. Detailed measurements or green analyses created by others are expressly forbidden.
The rule prescribes a penalty of two strokes for a first offense, with disqualification following a subsequent violation. The PGA Tour has not disclosed when Brennan committed the infractions.
A Rule Sparking Debate
Since its introduction, Model Rule G-11 has been a subject of debate. In 2022, then-Players’ Council President Rory McIlroy defended the rule strongly, stating that many players had become 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 neutralize individual strengths and advantages.”
German golfer Alex Cejka was also disqualified under this rule in 2022 for use of 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