Great Britain's Andy Murray has qualified for the semi-finals of the Rio Olympics courtesy of a battling victory over USA's Steve Johnson.
Murray, who won gold in London four years ago, needed more than two hours to continue his defence before eventually coming through 6-0 4-6 7-6(2).
It looked like being a straightforward route into the last four for the world number two when he made short work of the first set, dropping just two points against the serve as he broke Johnson three times.
The American did manage to create three break points in the fourth game, but Murray rescued them both to take the opener 6-0.
Johnson wasted little time coming up with a response in the second set, though, breaking in the opening game to finally get on the board and going on to hold serve throughout to force a decider.
The world number 22 looked as though he could be on course to dump the champion out when he gained the first break of the third set too, but Murray responded in kind immediately to force a tie-break.
Team GB's flagbearer was able to complete the victory in the breaker, wrapping it up with his first match point to keep his dreams of a second straight gold alive.
