(CNN) -- There was a dramatic end to the opening day of the Presidents Cup in San Francisco, which saw the United States finish with a 3.5 - 2.5 lead over the International side.
Justin Leonard missed a three-yard putt on the 18th to let go an American lead at the last.
Justin Leonard and Jim Furyk fought back from being three down against South Korea's Yang Yong-Eun and South Africa's Retief Goosen, to be one up arriving at the 18th.
Leonard faced a three-yard putt for birdie and the match, however, subsequent confusion over whether the hole had been conceded led the 37-year-old to miss the shot when he was eventually forced to play.
The Americans went on to lose the hole and half the match leading U.S. captain Fred Couples to tell reporters that he felt the finish had been "a little bit sour."
"Did we think we were going to be up 4-2? Yes, we really did, but it won't be the last putt ever missed at the Presidents Cup and it won't be the last time a little bit of a reversal was done.
"We'll just come out tomorrow and try to get three and half more points against this team," Couples added.
The President's Cup is a biennial event that pitches the United States against a team with members from everywhere in the world except Europe.
Elsewhere in the foursomes, Tiger Woods and partner Steve Stricker beat Australian Geoff Ogilvy and Japan's Ryo Ishikawa six and four.
Meanwhile, Phil Mickelson and Anthony Kim secured an early point as the Americans captured four birdies to win the last four holes, to seal a three and two win over Canada's Mike Weir and South African Tim Clark.
Australia helped the International side's cause -- antipodean Adam Scott and South Africa's Ernie Els earned a point with a two and one victory over Hunter Mahan and Sean O'Hair then Robert Allenby combined with Fiji's Vijay Singh to defeat the champion pairing of Lucas Glover and Stewart Cink (US and British Open champions respectively).
The Americans hit back with Kenny Perry and Zach Johnson overcoming Argentina's Angel Cabrera and Colombian Camilo Villegas.
Kim/Mickelson beat Weir/Clark 3&2
Mahan/O'Hair lost to Scott/Els 2&1
Glover/Cink lost to Singh/Allenby 1up
Perry/Johnson beat Cabrera/Villegas 2up
Woods/Stricker beat Ogilvy/Ishikawa 6&4
Furyk/Leonard halved with Goosen/Yang