Carlos Alcaraz looked little like the player who won two Grand Slams this year in a 6-1, 7-5 loss to Casper Ruud at the ATP Finals

Carlos Alcaraz suffered a loss in his first match at the ATP Finals in Turin. World no. 3 fell to Casper Ruud 6-1, 7-5 in an hour and 25 minutes, wasting a massive advantage in the second set and extending his struggles on an indoor court.

Alcaraz could be eliminated if he loses to second-ranked Alexander Zverev, who faces Andrey Rublev in his opener later on Monday.