The United States lead Europe two and a half points to one and a half after the opening fourballs at the Ryder Cup golf.
The Europe pairing of Justin Rose and Henrik Stenson won their match, but there was an 18th hole defeat for Rory McIlroy and Sergio Garcia against Phil Mickelson and Keegan Bradley.
Rookie pair Jordan Spieth and Patrick Reed easily beat Europe's Stephen Gallacher and Ian Poulter.
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Thomas Bjorn and Martin Kaymer halved their match with Rickie Fowler and Jimmy Walker.
