The U.S. women have won all six of their games through the first three days of 3-on-3 basketball's debut at the Olympics.
Kelsey Plum, who served as a graduate assistant for the University of Arkansas' women's basketball team last season, spotted up behind the arc for the game-winning two-pointer in a 21-19 victory over China to close out the day's action for the Americans.
The U.S. will be the top seed for Wednesday's semifinals and medal games.
Serbia is the lone undefeated team on the men's side.
Shots from inside the arc are worth one point and shots from outside the arc are worth two in 3-on-3.
The team that's ahead gets the victory in that case.
The U.S. men did not qualify for the eight-team tournament.