World No. 1 Jannik Sinner made it two wins out of two at the ATP Finals as he fought off Taylor Fritz in a high-octane clash inside the Inalpi Arena in Turin, Italy, on Tuesday.

In a repeat of September's U.S. Open final, home favorite Sinner delighted a raucous crowd with a 6-4 6-4 victory in the best match of the tournament so far.

American world No. 5 Fritz went toe-to-toe with Sinner throughout a contest ultimately decided by slender margins with one break of serve in each set.