ROME (AFP) — The Ryder Cup is set for a fiery climax on Sunday after Rory McIlroy's row with Patrick Cantlay's caddie overshadowed the American's late surge in Saturday's fourballs which gave the USA a glimmer of hope.

Sunday's 12 singles matches were already going to be spicy affairs as the USA need a record-breaking comeback from 10.5-5.5 down to win the trophy for the first time on European soil in 30 years.

And there could well be added needle between the two teams following the explosive aftermath of a dramatic and tension-packed win for Cantlay and Wyndham Clark sealed on the 18th green of the Marco Simone course in Rome, the third for the US in the four afternoon fourballs.

Cantlay and Clark prevailed in the day's final fourballs match against McIlroy and Matthew Fitzpatrick, sparking wild celebrations from the US team and fans.

However, McIlroy was enraged by the behavior of Cantlay's caddie Joe LaCava, who was waving his hat and refused to move out of the four-time major winner's way while he was waiting to take a putt which could have halved the hole and match for Europe.

Northern Irishman McIlroy was then filmed having another blazing row with an unidentified member of the USA team in the course carpark, having to be pulled away and bundled into a car by teammate Shane Lowry.

Europe captain Luke Donald told reporters that McIlroy thought "the line was crossed" with LaCava's behavior, causing a row which dominated headlines following an epic session which ended at nearly 7 p.m. local time (1700 GMT).

It was a dramatic third win from four afternoon fourballs for the USA and earned largely thanks to Cantlay, who sunk three crucial putts in the final three holes just as momentum appeared to have definitively swung in the Europeans' favor.

The most impressive was at 18, a 30-footer drained under huge pressure which eventually led to McIlroy losing his cool with his American counterparts, who had been trailing by seven points at lunchtime after a dismal effort in the morning foursomes.

"Hopefully have a ray of light and we can build on this session and try and pull off a big victory tomorrow," said Cantlay who competed Saturday without a cap, although he denied the gesture was in protest at players not being paid.

"The hat doesn't fit. It didn't fit at Whistling Straits (when the USA crushed Europe 19-9), and didn't fit this week. Everyone knows that," Cantlay added.