Andy Murray of the United Kingdom beat qualifier Roman Safiullin in a thrilling first-round encounter at the Swiss Indoors in Basel after falling down a set.
In the decisive set, the 35-year-old former world number one was also behind by a break.
But Murray came back from a 4-1 behind to defeat Russian Safiullin 6-7 (5-7) 6-3 6-4 as he impressively finished the match.
At the Vienna Open, Dan Evans and Cameron Norrie both achieved victory.
British No. 1 Norrie overcame an early set deficit against Argentine Pedro Cachin to win 3-6 6-2 7-6 (7-1) after forcing a tie-break in the final set.
Dan Evans, a fellow countryman, advanced from his first round by defeating German Oscar Otte 6-4 7-6 (7-3).
To advance to the quarterfinals, Norrie, the 13th-ranked player in the world, will face American Marcos Giron or Dutchman Tallon Griekspoor. Evans will play Russian Karen Khachanov.
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Murray, who has won three Grand Slams and is now ranked 49th in the world, was supposed to play against Sebastian Korda, who beat him in the quarterfinals of the Gijon tournament earlier this month, but Korda had to pull out because he was hurt.
After breaking his service in the first set, the Scot responded right away, but world number 93 Safiullin won the first set in a tight tie-break.
Murray then saved five opportunities to avoid going down a break early in the second set before converting on his third chance in the sixth game to tie the match.
After failing to avoid a fourth break point, Murray was again forced to come from behind in the fourth game of the decision.
He did it forcefully, pumping his fist in the air after converting the second of his three match points to book a date with Roberto Bautista Agut of Spain.
The number one player in the world, Carlos Alcaraz, defeated Jack Draper of Great Britain on Monday’s first day of play in Basel.
Following the coronavirus epidemic, the Swiss Indoors, won a record 10 times by local star Roger Federer before he announced his retirement in September, is being played for the first time in three years.