2. Lexi Thompson, 2017 ANA Inspiration

Lexi Thompson at the 2017 ANA Inspiration in Rancho Mirage, California. (Photo by Jeff Gross/Getty Images)

As she was walking off the 12th green during the final round of the ANA Inspiration, Thompson was informed by an official that she would be assessed a four-shot penalty – for replacing her ball in an improper spot on Saturday. It turned her 67 into a 71 and wiped out her two-stroke lead. A viewer noticed that Thompson had replaced her ball an inch away from its original location on a 1-foot putt on the 17th hole Saturday while watching the telecast.

After officials reviewed the tape, Thompson was assessed a two-shot penalty for putting her ball in the wrong spot (Rule 20-7c), and then a two-shot penalty for signing an incorrect scorecard (Rule 6-6d). She regained her composure to tie So Yeon Ryu, but lost on the first hole of a playoff.

The Rule was changed shortly thereafter, and Decision 34-3/10 (Limitations on Use of Video Evidence) is often referred to as the “Lexi Rule.”