Dennis Kudla has beaten Elliot Benchetrit 6-4 6-3 before being informed of a positive COVID test.
This is unfortunate for the American who has being informed he will now have to exit the tournament and head into self isolation.
Britain Cameron Norrie has claimed a 6-2 7-5 victory against third seed Frenchman Adrian Mannarino, setting up a clash with American Frances Tiafoe as both competitors look to secure a place in the Delray Beach Open semi finals.
In the female qualifying rounds, Francesca Jones has defeated Monica Niculescu to advance to the second stage of qualifying for the Australian Open
The Dubai hosted clash was eventually sealed in the 28th seed, where Jones was victorious 6-3 6-2.
With a grand slam main draw in reaching distance, Jones, who is a former top 30 player, will face off against Jana Fett.