The Swede faced Pablo Carreno Busta from Spain and it would turn out that the 16-ranked Carreno Busta was too difficult for the 23-year-old Ymer.
Ymer was in the first set for a long time but the Spaniard finally took it home with the numbers 7-5.
In the second set, the numbers were all the clearer.
A frustrated Ymer could not keep up, whereupon he hit himself in the head with his racket several times.
Second set ended 6-2 to Carreno Busta who won with a total of 2-0 in sets (7-5, 6-2).
CLIP: Novak Djokovic tears during US Open final (September 13)
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Novak Djokovic tears during the US Open final.
Photo: Eurosport