Tiger Woods was allegedly cheating on Lindsey Vonn with Jason Dufner’s ex-wife Amanda Dufner according to Radar Online and the National Enquirer (neither of which is renowned for unyielding accuracy). Jason Dufner and Amanda Dufner, now Amanda Boyd, ended their marriage quickly in April citing an “irretrievable breakdown of the marriage.”

The National Enquirer reported on Wednesday that Tiger Woods cheated on Lindsey Vonn, causing the couple’s breakup, with fellow PGA Tour player Jason Dufner’s ex-wife Amanda Dufner.

The tabloid claims that while he was dating Vonn, Woods was carrying on a relationship with 27-year-old Amanda Dufner, who divorced PGA Tour player Jason Dufner earlier this year. The Dufners cited an “irretrievable breakdown of the marriage,” with no further details, in their divorce filings in April.

The Enquirer report, excerpted on Radar Online’s website on Wednesday, claims that Woods flew the former Amanda Dufner to Seattle when he played practice rounds at U.S. Open venue Chambers Bay last month.

Woods, 39, broke up with Vonn in May, only days after she had appeared on a series of talk shows and had spoken openly about what a good boyfriend and father Woods had been during their time together. The tabloid report claims that Vonn broke off the three-year relationship after learning Woods had been carrying on an affair with Amanda Dufner.

Amanda Dufner is active on social media, often posting photos of herself in bikinis.

Tiger must not have been able to resist — and maybe the relationship with Amanda is part of the reason he played so poorly in the 2015 U.S. Open.