The American went on to lose the sport with Karatsev drawing the match degree at 1-1 in units. But Shelton discovered one other gear heading into the third set as he took again management.

And he stepped it up even additional within the fourth set to bagel his opponent and attain the fourth spherical. Shelton now faces a rematch of his Australian Open quarter-final opponent Tommy Paul with the latter popping out on prime on that event and he is hoping for a distinct end result on this event.

He stated: "I think I panicked a little bit, pressed early in the match, and he kind of got on top of me and was the frontrunner from there. I hope to do a little bit better job of that this time around."