TURIN, Italy, Nov 11 (Reuters) - An off-colour Carlos Alcaraz suffered a shock 6-1 7-5 defeat against Norway's Casper Ruud in his opening match at the ATP Finals as the Spaniard's hopes of winning the year-end title for the first time suffered a blow on Monday.

Carlos Alcaraz opened his account at the ATP Finals on Wednesday with an entertaining 6-3, 7-6 (10/8) win over Andrey Rublev, while Casper Ruud missed an early chance to reach the semi-finals after losing in straight sets to Alexander Zverev.

Carlos Alcaraz opened his account at the ATP Finals on Wednesday with an entertaining 6-3, 7-6 (10/8) win over Andrey Rublev, while Casper Ruud missed an early chance to reach the semifinals after losing in straight sets to Alexander Zverev.

Over his last 10 tournaments, Alcaraz has won 83.3% of his service games and 35.8% of his return games. Over his last 10 tournaments, Ruud has won 25.7% of his return games and 80.1% of his service games.

Norway's Casper Ruud eased to a straight-sets victory over Carlos Alcaraz on Monday as the Spanish star's bid for a maiden ATP Finals title got off to a poor start.

Carlos Alcaraz overcame illness to defeat Andrey Rublev at the ATP Tour Finals in Turin. The 21-year-old Spaniard won 6-3 7-6 (10-8) despite cutting short his practice session on Tuesday after struggling with a chest complaint.

Spain's Carlos Alcaraz made light of feeling under the weather as he dispatched Russia's Andrey Rublev in impressive fashion to revive his ATP Finals hopes on Wednesday. The Spanish four-times Grand Slam champion has been suffering with respiratory issues in Turin and wore pink nasal tape against Rublev but enjoyed a resounding 6-3 7-6(8) victory.

Another Alcaraz passed through Turin. In fact, the most genuine Alcaraz. Little to do with the erratic, discouraged, and cold-ridden player who lost in his debut at the ATP Finals against Casper Ruud.