Ben Shelton defeats Frances Tiafoe in US Open quarter-final – as it happened

• Shelton wins in four sets in all-American quarter-final
• Send Bryan a tweet at @BryanAGraham or email him

First set: Tiafoe 2-6 Shelton

Shelton strolls through the finish line of the opening set, punctuating the comfortable hold with a 110mph second-serve ace down the middle and a 127mph service winner out wide. Heck of a start for Shelton, who won 10 of 13 first-serve points and didn't face a single break point.