Russell Henley, one-ball rule
Nov. 17: After finishing the second round at the Mayakoba Golf Classic, Russell Henley realized he violated the PGA Tour’s one-ball rule. The rule states players can only use one specific brand and model of ball during a round and the penalty for using a different model is two strokes per hole that the ball is used. Henley received eight penalty strokes–two per hole for Nos. 9-12–turning what had been a 69 into signing for a 77.