New York, Sept. 5 -- Ben Shelton overcame a tough challenge from Canada's Denis Shapovalov to reach the fourth round of the US Open after a four-set victory in a match that extended into the early hours of Saturday (local time).

Shelton defeated Shapovalov 7-6(3), 6-7(5), 6-2, 6-4 in a three-hour and 22-minute battle, maintaining his unbeaten record against the Canadian in their Lexus ATP head-to-head meetings, according to the website.

The opening two sets were closely contested, with Shelton taking the first-set tie-break before struggling to close out the second set. The American twice had chances to serve for the match at 5-4 and 6-5, but Shapovalov fought back to force another tie-break and level the contest.

Shelton responded str...