Dan Evans claimed his fourth victory over a top-20 player this season by coming from a set down against Fabio Fognini at the Dubai Duty Free Tennis Championships.
The British No 1 trailed in all three sets but refused to let 11th-ranked Fognini pull away and secured a 3-6 6-4 7-5 victory after two hours and 39 minutes.
Evans struggled to get on the front foot against one of the game's most talented ball-strikers and quickly found himself 4-0 down in the opening set.
He recovered one break to at least get himself into the match and then fought back from 3-1 to take the second set, with Fognini playing a poor final game.
- Will surgery be a blessing in disguise for Feds?
- Sky VIP - thousands of prizes this February including Premier League tickets, trips to Hollywood, Australia and more
The Italian's intensity fluctuated and Evans kept fighting, twice recovering from a break down in the deciding set and then taking his sixth match point in the 12th game.
"It's great to get through the tight ones, especially against someone as good as Fabio," Evans told Amazon Prime.
The 29-year-old will face Frenchman Pierre-Hugues Herbert in the second round.
Benoit Paire snapped his five-match losing streak against Marin Cilic with a 2-6 7-5 7-6 (7-1) win.
The eighth seed saved four match points on his way to a final-set tie-break, which he dominated to set up a contest against fellow countryman Richard Gasquet for a spot in the quarter-finals.
In-form Stefanos Tsitsipas saw off Pablo Carreno Busta in straight sets.
The second seed from Greece, fresh from defending his title at the Open 13 Provence in Marseille at the weekend, was taken to a tie-break in the first set.
But Tsitsipas breezed through that and dropped just one more game in a 7-6 (7-1) 6-1 victory.
Tsitsipas, who has now won 10 consecutive sets, told the official ATP website: "I'm not spending extra hours out on the court, which for sure is going to help me."
Check our news, reports and reaction from all major tennis events by following us on skysports.com/tennis, our app for mobile devices or our Twitter account @skysportstennis.