Carlos Alcaraz capped a strong breakthrough season by beating Sebastian Korda to win the Next Gen ATP Finals in Milan.

The 18-year-old beat Korda 4-3 (5) 4-2 4-2 to become the first Spaniard to triumph in the prestigious 21-and-under event.

Alcaraz had started the year ranked 141 in the world rankings but claimed his first top-level title in Umag before marching to the quarter-finals of the US Open.

Korda had his chances in the opening set but was unable to convert any of five break points and Alcaraz held on to force his way through a tie-break.

Alcaraz stepped up the pace in the second set and maintained his momentum through the third to complete his victory after 84 minutes.

Alcaraz said in his on-court interview: "It is amazing - to be able to win this tournament means a lot to me.

"I am so excited right now and emotional. I was very, very nervous at the start. I had to be calm to save the break points. I know Korda is serving very well, so I had to play my best in those moments."