American golfer Patrick Reed – the 2018 Masters champion – tops the leaderboard through 36 holes at Winged Foot in New York.
Justin Thomas navigated a tricky Winged Foot course to top the leaderboard after the first 18 holes on Thursday.
A group of stars are chasing Xander Schauffele, who grabbed the lead at the Charles Schwab Challenge.
The USA were on track to sweep all four matchups in the foursomes, until the Internationals rallied on Saturday.
The United States are on a roll in Saturday afternoon's foursomes at Royal Melbourne Golf Club.
Just as the Internationals appeared set to create some significant breathing space, the USA mounted a late charge on Friday.
The International team – already leading – are projected to score another four points in Friday's second session.
Friday's format will turn to foursomes, with seven-time defending champions the United States trailing the Internationals 4-1 in Melbourne.
Defending champions the United States have work to do following Thursday's opener against the Internationals at Royal Melbourne.
Tiger Woods continues to purr on the opening day but the Internationals have the upper hand against the USA.