The United States hold a narrow one-point advantage over Europe in the Ryder Cup after edging Friday's opening fourball sessions.
Out to reclaim the title after an agonising defeat at Medinah two years ago, the US opened up a 2 1/2 to 1 1/2 lead ahead of the first foursomes matches at Gleneagles, with Phil Mickelson and Keegan Bradley eventually emerging victorious against world number one Rory McIlroy and Sergio Garcia in a tense final match.
Rookies Jordan Spieth and Patrick Reed stole the show as they picked up a convincing 5 and 4 win over Ian Poulter, so often Europe's talisman, and home favourite Stephen Gallacher.
The American duo made light of a lack of Ryder Cup experience to get the USA on the board after Justin Rose and Henrik Stenson had triumphed by the same margin over Bubba Watson and Webb Simpson.
Thomas Bjorn and Martin Kaymer were two up with three to play, only for Rickie Fowler and Jimmy Walker to salvage half a point in game two.
Mickelson and Bradley - a hugely successful pairing at Medinah - then claimed a 1up victory over McIlroy and Garcia, courtesy of the former claiming a decisive birdie on the 18th.
Europe wrapped up the first point of the 40th Ryder Cup courtesy of Rose and Stenson.
Early birdies helped put the Europeans in control before a poor putt at the ninth from Simpson, who opened proceedings with a mis-hit drive off the first tee that barely reached the fairway, allowed Stenson to extend the home advantage.
Rose finished things off with another birdie at 14, as Watson and Simpson were left to rue a round where they failed to break par.
The Americans drew level thanks to a hugely impressive morning's work from Spieth and Reed.
The youngest pairing in Ryder Cup history, with a combined age of 45, were dominant against experienced campaigner Poulter and Gallacher, taking turns to make birdies through the first 11 holes.
There was to be no way back for the European duo, although Poulter will be confident of bouncing back having won 12 of his previous 15 Ryder Cup matches.
With the overall result in the balance, Walker found two birdies in the final three holes to ensure he and Fowler earned a half against Bjorn and Kaymer.
A stunning eagle from Bradley at 16 levelled the score in the last fourball of the day and Mickelson, in his 10th Ryder Cup, duly birdied the last to extend his and Bradley's winning run together to four matches.