The scheduling of the Cincinnati Open final on Monday has caused chaos ahead of the start of the new-look US Open mixed doubles event

The No. 1-ranked Sinner, the defending champion in singles at Flushing Meadows, was supposed to compete in mixed doubles with Katerina Siniakova.

It leaves Sinner battling to recover in time for the US Open singles, which gets underway this weekend. He is the defending champion, having beaten Taylor Fritz in last year's final. He will be desperate to retain his crown but will need to be in top condition in order to stand the best chance of success.