Italy's Jannik Sinner retained his ATP Finals title on Sunday, sending the Turin crowd wild as he battled past Spanish world number one and rival Carlos Alcaraz 7-6(4) 7-5 in the decider to the season-ending championships, Reuters reported.

Sinner, backed by a raucous Italian crowd, fell to the floor after breaking his rival's serve in the final game before racing to celebrate with his team as chants of 'Ole, Ole, Ole, Sinner, Sinner' rang around the Inalpi Arena.

"Finishing in front of the Italian public was a fantastic thing, maybe even better than last year, thank you very much for the support, it was incredible," Sinner said, according to Reuters.