Sinner will be joined in the last four by Taylor Fritz, who rallied from a set down to defeat Alex de Minaur earlier on Thursday.

Just as in New York, Sinner had the final answer more often than Fritz, as the world No. 1 beat his opponent in his now-customary way.

The Italian is 3-1 against the American, but no one in his group has secured a spot in the semis.