The 22-year-old retired from his quarter-final clash against France’s Ugo Humbert at the Japan Open on Sunday.

Draper required treatment on an abdominal problem and, after trying to continue, had to call it a day at 7-5 2-1 down.

Draper’s camp say he does not yet know the extent of the injury but feels the turnaround from Tokyo to Shanghai is too quick.

The Japan Open was Draper’s first ATP tournament since he reached the semi-finals of the US Open earlier this month.

The world number 20 played for Great Britain in the Davis Cup a few days later but lost both of his matches.

Afterwards, Draper complained that the current tennis schedule is too busy.

“It’s a mental calendar,” he said. “There’s literally no break. It’s really mentally and physically challenging.”

Carlos Alcaraz beat Karen Khachanov 7-5 6-2 at the China Open today and will face another Russian, Daniil Medvedev, in the semi-final.