Bryson DeChambeau told Brooks Koepka "it's nice to be living rent free in your head" as the two PGA Tour stars traded barbs on social media.
There is no love lost between DeChambeau and Koepka, particularly after footage of the latter emerged during a post-round interview at the US PGA Championship.
In a leaked viral video, four-time major champion Koepka was seen rolling his eyes at reigning U.S. Open winner DeChambeau and cursed in frustration during the interview.
'The Match' was announced on Wednesday, with DeChambeau partnering Green Bay Packers quarterback Aaron Rodgers in an exhibition battle against PGA Championship winner Phil Mickelson and Tampa Bay Buccaneers superstar Tom Brady.
Afterwards, Koepka and DeChambeau continued their growing feud as the former tweeted: "Sorry bro @AaronRodgers12."
@BKoepka It’s nice to be living rent free in your head!— Bryson DeChambeau (@b_dechambeau) May 26, 2021
DeChambeau responded by tweeting: "@BKoepka It's nice to be living rent free in your head!"
Amid the exchange, six-time major winner Mickelson wrote: "I feel like I'm in the middle of something and should step aside. [Except they want the CURRENT PGA champ:]."
There has been tension since 2019 after Koepka called out DeChambeau for slow play, while the later responded by taking aim at his fellow American's physique in 2020.
"I don't think his genetics even make him look good," DeChambeau said. "Did you see The Body Issue? He didn't have any abs. I have abs."
'The Match' will take place on July 6 at Moonlight Basin in Big Sky, Montana.
Mickelson has been a regular at this event since the first instalment in 2018, where he defeated Tiger Woods in a one-on-one match up to earn a lucrative $9million payout.
In May 2020, Mickelson first partnered NFL legend Brady – who earned a seventh career Super Bowl ring by leading the Buccaneers to glory in February – where they were beaten by Woods and Peyton Manning.