Tuesday 30 October 2018 11:29, UK
Kyle Edmund has called time on his 2018 campaign after a scan showed a small amount of fluid behind his left knee.
The injury is not regarded as serious but Edmund has pulled out of the Paris Masters this week.
It has been a breakthrough year for the 23-year-old who recently captured his first ATP Tour title, when he beat Gael Monfils in the Antwerp final.
That result capped a fine 2018 for Edmund, who is currently No 15 in the ATP World Rankings.
Edmund, whose record is 36-21 for the year, had still been in the race for a place at the ATP Tour Finals in London next month, but needed a good run in the French capital.
Richard Gasquet set up a second-round clash with defending champion Jack Sock as he defeated Denis Shapovalov.
The Frenchman saw off Canada's Shapovalov 6-4 7-6 (7-3) in an hour and 39 minutes.
Meanwhile, Serbia's Filip Krajinovic, last year's beaten finalist, made a first-round exit as he lost 7-5 6-2 to Russian Karen Khachanov, who will now face lucky loser Matthew Ebden.
Second seed Novak Djokovic's opponent in round two will be Joao Sousa after the Portuguese qualifier beat Italy's Marco Cecchinato 7-5 6-3.
And for fourth-seeded Alexander Zverev and fifth-seeded Marin Cilic it will be Frances Tiafoe and Philipp Kohlschreiber respectively. Tiafoe got past Nicolas Mahut in straight sets, while Kohlschreiber came from behind to triumph against Robin Haase.