Diego Schwartzman claimed his maiden ATP World Tour title after Gregor Dimitrov suffered a physical and mental meltdown in the final set of their title decider in Istanbul.
Schwartzman won 6-7 (5-7) 7-6 (7-4) 6-0 on Sunday, but only after his Bulgarian opponent brought a premature ending to the match.
Dimitrov, having already been handed two warnings by umpire Mohamed Lahyani, broke a string at 0-5, deuce and induced a third by violently smashing his racquet on returning to his chair.
Lahyani had little option but to issue a game penalty, handing Schwartzman the title amid boos from the crowd.
Dimitrov issued a swift apology for his actions, stating in the on-court presentation: "I let my family down, I let my team down, I let my fans down with that kind of behaviour, which I definitely apologise for.
"It's all my fault, there's not much I can say."
Both players struggled to hold their serve in a first set that was low on quality, before Dimitrov prevailed in a tie-break.
Schwartzman twice fell a break down prior to forcing another breaker in the second, this time coming out on top as Dimitrov converted just one of his service points.
With Dimitrov struggling physically, the third set was a procession, prompting the second seed to explode with frustration.