The USA are up in three games in this morning's delayed fourballs.
Poulter and Fisher suffered a body blow on the 12th when Stricker chipped in from short of the green for a birdie to go one up, with the Americans now ahead in three of the four matches.
That meant the top match was becoming ever more important for Europe and Westwood thankfully drove the green on the 15th and two-putted for a winning birdie to go two up with three to play.
Donald was having to carry Harrington in the final match, the Irishman yet to make a single birdie after being a controversial wild card selection by captain Colin Montgomerie.
After Overton birdied the 11th, Donald followed him in from 10ft to salvage a half and remain two down.
Lee Westwood & Martin Kaymer 2 up on Phil Mickelson & Dustin Johnson (after 15 holes)
Rory McIlroy & Graeme McDowell 1 down to Stewart Cink & Matt Kuchar (14)
Ian Poulter & Ross Fisher 1 down to Steve Stricker & Tiger Woods (13)
Luke Donald & Padraig Harrington 3 down to Bubba Watson & Jeff Overton (12)