If you come at Brooks Koepka, you better not miss.

Bryson DeChambeau learned this lesson the hard way after taking a shot at the four-time major winner's lack of abs on Wednesday.

Koepka acknowledged DeChambeau's comments, admitting he is two short of a six-pack with the ultimate flex.

The feud over his physical appearance stemmed from a comment DeChambeau made about Koepka while playing Fortnite on his Twitch stream.

"I don't know if (Koepka's) genetics make him look good, to be honest," DeChambeau said. "(In) that (ESPN) Body Issue, he didn't have any abs, I can tell you that. I got some abs."

DeChambeau's heightened interest in physique comes from a revamped workout plan where he's gained roughly 30 pounds of muscle in the offseason. He claims to have worked out twice a day since early October in preparation for 2020.

The two Americans are in action this week at the Abu Dhabi Championship. Koepka fired an opening-round 66 while DeChambeau limped to an even-par 72.