Britain's Jack Draper has withdrawn from the Shanghai Masters after injuring himself at the Japan Open on Sunday.

Draper had treatment on an abdominal issue during his quarter-final against France's Ugo Humbert and ultimately retired from the match.

The 22-year-old was competing in his first ATP tournament since reaching the US Open semi-finals earlier in September.

World number 20 Draper also featured in two of Great Britain's three Davis Cup ties in Manchester, losing both his singles matches.

He is next scheduled to play at the Vienna Open, which begins on 21 October.

Draper previously spoke out about the tennis calendar, describing the current schedule as "mental".

The Masters event in Shanghai - the highest-ranked regular tournament below the Grand Slams - begins on 2 October.

Elsewhere, Carlos Alcaraz set up a semi-final with Daniil Medvedev at the China Open in Beijing.

Spanish four-time major winner Alcaraz beat Russia's Karen Khachanov 7-5 6-2 at the ATP 500 event, while former US Open champion Medvedev beat Italy's Flavio Cobolli 6-2 6-4.