Masters champion Danny Willett is "bitterly disappointed" with an article written by his brother which describes American Ryder Cup fans as a "braying mob of imbeciles."
School teacher Peter Willett penned a column for National Club Golfer magazine and offered his forthright opinions on what each side needs to do to secure victory at Hazeltine.
"For the Americans to stand a chance of winning, they need their baying mob of imbeciles to caress their egos every step of the way," he wrote. "Team Europe needs to shut those groupies up.
"They need to silence the pudgy, basement-dwelling, irritants, stuffed on cookie dough and p**** beer, pausing between mouthfuls of hotdog so they can scream 'Baba booey' until their jelly faces turn red.
"They need to stun the angry, unwashed, Make America Great Again swarm, desperately gripping their concealed-carry compensators and belting out a mini-erection inducing 'mashed potato,' hoping to impress their cousin.
"They need to smash the obnoxious dads, with their shiny teeth, Lego man hair, medicated ex-wives, and resentful children. Squeezed into their cargo shorts and boating shoes, they'll bellow 'get in the hole' whilst high-fiving all the other members of the Dentists' Big Game Hunt Society.
"Darren Clarke needs to pick his pairs carefully, they need to support each other intelligently, and the crowd needs to be dealt with swiftly.
"If these things happen, Europe will win, and I'll try to support gracefully by embracing the same sense of fair-mindedness that has permeated this unbiased article. If not, the Americans will claim their second victory this century... those fat, stupid, greedy, classless, b*******."
Asked about the article, European captain Clarke said: "I just was made aware of the article about an hour ago. I hadn't seen it. As soon as I did, I went out to find Danny, who was playing in the last group out there this morning.
"I showed it to Danny and he's bitterly disappointed in his brother's article. It is not what Danny thinks. It is not what I think. It is not what Team Europe stands for.
"Danny was unaware of it and he fully intends to speak to his brother, express his displeasure to his brother about it.
"I was obviously very disappointed in it, as well, because that's an outside person expressing their opinion which is not representative of what our thoughts are."
US captain Davis Love said he had resisted the temptation to read the article, adding: "If I read it, I'm just going to get mad. If I read it, I'm just going to get defensive. So I just try to ignore it."
