Edmund is also set to drop out of the world's top 50 when the new rankings are announced next week after a 6-4 7-6 (7-3) loss to Frenchman Jeremy Chardy.

His last win came was against over Nick Kyrgios at the Rogers Cup in August.

Dan Evans or Cameron Norrie will replace the 24-year-old at the top of the British rankings.

Evans, beaten in qualifying in China, is currently set to do so, but third-ranked Norrie could still leapfrog them both after moving into the second round of the Shanghai Masters with a dominant win over Gilles Simon.

Norrie, 24, had qualified to reach round one and broke his French opponent twice to take the opener 7-5.

He then broke serve three times to take the second set 6-2 and faces Russian world number four Daniil Medvedev next.

Later on Monday, fellow Briton Andy Murray faces Argentine Juan Ignacio Londero.