Open Championship 2021: The American pair have been kept apart for the opening two rounds of the Open Championship but could be on the same Ryder Cup team in September.
DeChambeau said before the US Open last month that their feud was “banter” but Koepka appears to see it differently.
The four-time major champion says it goes back to a conversation in 2019.
The rivalry seemingly began in January that year after Koepka questioned DeChambeau’s slow play and the world number eight believes they made a deal to put it behind them at the Northern Trust event seven months later.
We had a conversation at Liberty, and he didn’t hold up his end of the bargain and I didn’t like that, so I’ll take my shots,” said Koepka.
He didn’t like that I had mentioned his name in slow play, so we had a conversation in the locker room, and then I guess we said something else in the press conference but didn’t mention his name in it.
Koepka says DeChambeau then approached his caddie, Ricky Elliot, saying “you tell your man if he’s got something to say, say it to myself”.
I thought that was ironic because he went straight to Ricky,” added Koepka. “Ricky told me and I just walked right over to him, we had a conversation.
We both agreed we’d leave each other out of it and wouldn’t mention each other, just kind of let it die off, wouldn’t mention each other’s names.