Plus, Dustin Johnson and Rickie Fowler were rolling with a strong first-session victory. In a match featuring a Ryder Cup vet and rookie on each side, the European duo took a 7 up lead through nine holes. Europe didn't just win all four foursomes matches but it ran away with the series, winning by a margin of at least 3 and 2 in each match. Having sat out only one session in his previous seven Ryder Cups, he was then stood down from the foursomes. He silenced his critics in flawless fashion, partnering Ian Poulter to a four and two win over Bubba Watson and Webb Simpson.
After Olesen and McIlroy both missed longer birdie putts, the Europeans conceded the hole to close out the four-ball match.
With an unprecedented number of spectators packing the huge grandstands and the surrounding areas on the opening hole at Le Golf National, Justin Rose and Jon Rahm arrived on the tee shortly before 8:05am local time and were greeted by a rousing Icelandic thunderclap. The U.S. never led in the match until it won.More news: Trump describes Kavanaugh as a ‘gem,’ says he’s been maligned by Democrats
Rose hit into the water on the 18th to make a bogey, and Koepka secured a par for a 1-up victory. Although Tommy Fleetwood and Francesco Molinari spared a whitewash by beating Tiger Woods and Patrick Reed, the overall picture was bleak and the form of McIlroy worrying - grim and grimmer.
In 2012, following the USA side's worst singles meltdown, then-captain Davis Love III pointed to the pin position on Sunday at the 17 hole on the right portion of the green.More news: UK's labour opposition to vote against Brexit deal
Four morning four-ball matches were set to be followed by four afternoon foursomes matches on Friday and Saturday with 12 concluding singles matches Sunday.
Johnson missed a 5-foot par putt to fall 1 down through eight holes.
Johnson and Fowler gave the U.S. its first point, closing out the 4-and-2 victory over McIlroy and Olesen without even having to finish the par-3 16th.More news: U.S. SEC sues Tesla CEO Elon Musk, alleges fraud over tweets