Jack Draper had to battle back from 4-2 down in a deciding set tie-break to beat Jaume Munar in the first round of the Cincinnati Open.
British number one Draper won 7-5 3-6 7-6 (7-5) against the Spanish qualifier and will face Greek ninth seed Stefanos Tsitsipas in the next round.
The 22-year-old came through despite an injury concern late in the deciding set - calling for the physio when he was 6-5 up to receive treatment for an abdomen problem.
He looked to be struggling in the early stages of the tie-break but finished strongly to seal victory with the second of three match points.