Watch: Multiple PGA Tour winner loses it (!) during 3M Open with AimPoint protest

Former U.S. Open champion Lucas Glover appeared to stage a mini protest about the use of AimPoint on the PGA Tour during the final round of the 3M Open in Minnesota. 

Glover, who has always been critical of the green-reading technique, drilled in a nine-foot putt for birdie on the 10th at TPC Twin Cities. 

Instead of immediately walking to the cup to retrieve his golf ball, the 46-year-old American decided to walk back towards his playing partner, Max Greyserman, and take off his shoes. 

Glover then marched back towards the hole, grabbed his ball and walked off the green clutching his shoes and putter looking visibly annoyed. 

For his part, Greyserman didn't react and sank his four-foot putt for birdie. 

Watch the clip here:

Glover is clearly demonstrating his disdain for AimPoint, which is used by several major champions and multiple PGA Tour winners. 

Adam Scott, Viktor Hovland, Justin Rose, Keegan Bradley, Max Homa, Collin Morikawa, Tommy Fleetwood, Sam Burns, Ludvig Aberg and Dustin Johnson are among those who use the technique on the greens. 

What has Lucas Glover said about AimPoint?

Lucas Glover previously claimed there was no statistical data that proved AimPoint made anyone a better putter.

He suggested that it should be banned as part of his wide-ranging plan to combat slow play on the North American circuit.

Glover softened his stance earlier in the year during an appearance on the Trey Wingo podcast. 

His biggest issue, though, was players walking across fellow competitors' putting lines as they went through their green-reading routines.

"I see these people stepping all over the green and each other's lines from two feet," he told the pod. 

"It's very frustrating, but we're all out here trying to do the same thing and that's trying to get the ball in the hole as quickly as possible. 

"And if that helps people, great. It's not for me to tell them they can or cannot do it, but it is up to the players to monitor our pace sometimes.

"That's where I got frustrated a couple of years ago with those comments. Sometimes it just takes too long for somebody to get ready to hit it."

What is AimPoint?

AimPoint is a green-reading technique used by professional golfers to help determine the correct line and pace for putts. 

The system uses slope, green speed and a golfer’s feel for the contours of the putting surface to calculate where a player should aim before making a stroke.

The method requires players to assess the slope of a putt, often by standing near the line and using their feet to gauge the break. 

They then use a finger-based reference system while viewing the hole from behind the ball, with each finger representing a different amount of break.

Its usage has become increasingly common on professional tours, though many critics suggest that it only adds to pace of play problems.