The qualifier In the second round of the ATP 250 event, world number 37 Griekspoor defeated Fearnley 7-6 (7-0) 6-3.
In his early professional career, the 23-year-old Scot, currently rated 99th, was hoping to earn his highest victory by ranking.
Fearnley, who was rated 646th at the beginning of this year, has experienced a stunning increase since graduating from university in the United States, swiftly moving up into the world’s top 100.
The British men’s number three took a break in a tense opening set, but Griekspoor’s serve was under a lot of duress when he broke back to love for it.