Top-ranked Jannik Sinner suffered only his fifth loss of the season on Saturday as Andrey Rublev knocked him out in the ATP Montreal Masters quarter-finals 6-3, 1-6, 6-2.
The match was interrupted for 30 minutes by rain at the end of the first set.
After dropping the first set but sweeping the second, Sinner often looked out of energy in the third, seemingly exhausted and often loosening his right hip.
Sinner had won a third-round match earlier in the day, his double duty caused by rain washing out all play on Friday.
The US Open tuneup event was the first for the world number one since losing a Wimbledon quarter-final a month ago while feeling ill and then missing the Olympics with tonsillitis.
He is due to travel to Cincinnati for next week’s Masters, last big event before the US Open.
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