RIO DE JANEIRO (AP) — The Latest on the 2016 Summer Olympics in Rio de Janeiro (all times local):
5:15 a.m.
Britain's Andy Murray is going to see if he can turn his trademark menacing grimace into a smile.
The defending champion, who is trying to become the first player to win two Olympic singles golds, faces Juan Martin del Potro of Argentina in the men's final Sunday in Rio de Janeiro.
Murray is going to have to work extra hard, though, because del Potro is on a roll, having ousted both the top player in the world, Novak Djokovic of Serbia, and No.