Rafael Nadal, in his first match since announcing he would be retiring after the Davis Cup next month, lost 6-3, 6-3 to Carlos Alcaraz at the Six Kings Slam on Thursday.

The 38-year-old Nadal, who announced last week he would retire from tennis after the Davis Cup Finals in Malaga in November, lost 6-3, 6-3 to 21-year-old Alcaraz in the semi-finals of the Six Kings Slam event in Saudi Arabia.

Rafael Nadal will have one final battle with Novak Djokovic when they meet in the Six Kings Slam exhibition event on Saturday. The Spaniard is retiring after next month's Davis Cup finals in Malaga, bringing the curtain down on an incredible career.