Ben Shelton has broken a 31-year US Open record after defeating Frances Tiafoe (Image: GETTY)

Twenty-year old Ben Shelton blasted his way past fellow African American Frances Tiafoe 6-2 3-6 7-6(7) 6-2 and into the U.S. Open semi-finals on Tuesday, a match up that lived up to its blockbuster billing.

With the victory, the big hitting Shelton becomes the youngest American to reach the U.S. Open men’s last four since Michael Chang in 1992.

His next opponent will be Novak Djokovic, one of the greats of the game and 23 times Grand Slam winner.

“Feeling like I left it all out here tonight,” said the 47th ranked Shelton, who is still searching for his first ATP Tour win.

“Emotional battle and thanks all you guys for staying so late.Hell of an atmosphere. Thanks for pushing me over the line,” he said.

“He (Djokovic) has won 23 of these (Grand Slams), it doesn’t get much better than that,” said Shelton. “It’s been tough the last two matches, I’ve been playing Americans but hopefully you guys bring it for me two nights in a row.”

The 10th seeded Tiafoe, who electrified the home crowd with a run to the semi-finals last year, had dropped only one set en route to the quarter-finals but it did not take long for Shelton to take a second.

Shelton came out guns blazing, with his groundstrokes struck with such venom they drew gasps from the capacity crowd.

After holding his first two serves Tiafoe had no answers for his opponent’s explosive forehand as Shelton claimed five straight games to snatch opening set.

But there was no panic from Tiafoe as he got to grips with Shelton’s big swings, which started to miss the mark.

He would get his first break chances of the match in the sixth game of the second and levelled at a set apiece.

In a wild third set the momentum seemed to swing on every serve with six breaks, three from each player, in the first eight games.

The set would go to a tie-break that was just as unpredictable with Shelton taking back-to-back double faults, including one on set point, before finally winning it 9-7.

There was no mistaking where the momentum was going into the fourth with Shelton hammering a backhand winner down the line that a flat-footed Tiafoe could only watch to clinch the early break.

Another break at 5-2 and Tiafoe’s fate was sealed with Shelton holding serve for the win.