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Mahan got the Americans off to a flying start with a birdie at the first before Furyk, who has only ever won one of his previous 10 fourball Ryder Cup matches, put them 2 up with a lengthy birdie putt at the third.
Donaldson and Westwood were playing solid, but unspectacular golf and needed birdies to claw the match back in their favour.
They couldn't find any, though, and USA were 3 up when Mahan birdied his second hole of the morning at the seventh.
Donaldson and Westwood did birdie the eighth and ninth, but so did the Americans to maintain their three-hole lead.
Head this way for our minute-by-minute updates of the back nine.