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.
A stunning approach shot to the 15th green helped Henrik Stenson secure a one-shot triumph in the Bahamas.
Tiger Woods impressed again on a chaotic day at the Hero World Challenge, as Patrick Reed fell away spectacularly and Gary Woodland led.
Tiger Woods looms large at the Hero World Challenge, where fellow American Patrick Reed holds a three-shot lead.