British number one Cameron Norrie's hopes of reaching next month's ATP Finals suffered a setback after he lost to Marcos Giron at the Vienna Open.
Norrie was beaten 6-3 6-4 by the American in the second round.
Giron broke his opponent twice to take the first set and went on to secure victory after Norrie double-faulted at 3-3 in the second.
He will play Grigor Dimitrov, who beat beat Andrey Rublev 6-3 6-4, in the quarter-finals.
Norrie is ranked 13th in the world, with only the top eight players making it to the end-of-year ATP Finals, being held in Turin during November.
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