Dominic Thiem, of Austria, and Alexander Zverev, of Germany, pose for photos after the men's singles final of the US Open tennis championships, Sept 13, 2020, in New York. (SETH WENIG / AP)

NEW YORK - Austria’s Dominic Thiem finally claimed his first Grand Slam title with a stunning comeback to beat Germany’s Alexander Zverev 2-6 4-6 6-4 6-3 7-6(6) in Sunday’s US Open final.

Dominic Thiem, beaten in his first three Grand Slam finals, started as favourite but appeared to have blown his golden chance as he fell two sets behind

The 27-year-old world number three, beaten in his first three Grand Slam finals, started as favourite but appeared to have blown his golden chance as he fell two sets behind.

Thiem, who had dropped only one set en route to the final, looked stifled by nerves early on but gradually broke the shackles to hit back from a break down to take the third.

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Zverev faltered on serve at 3-4 in a high-quality fourth set allowing Thiem to take the contest to a decider.

A limping Thiem trailed 5-3 in a high-quality decider but summoned some incredible baseline winners to take it into a nerve-jangling tiebreak. An astonishing climax saw Thiem squander two match points from 6-4 but when a third opportunity came Zverev fired wide after four hours and two minutes.