Caleb Ralston pulled off the first upset in the men's singles event at the Keys Finance Ulster Senior Open tournament at the Boat Club.
The 15-year-old Lurgan player last night defeated experienced fourth seed Henrik Enoksen (David Lloyd) in straight sets, 7-6 6-4, to book his place in the quarter-finals in his first appearance in the championship.
"I knew he had a big serve so I decided to stand well back in order to cope with it and, fortunately, it worked for me and I was able to return pretty well most of the time," he said.
Enoksen wasn't the only seeded player to exit the tournament as Stephen McCausland was forced to retire with an ankle injury when trailing 6-3 1-0 to Downshire's Ross McCarey.
Qualifier Jordan McKeown was involved in a two-and-a-half hour battle with McCausland's Donaghadee club mate Aaron Stubbs, who prevailed on a 6-3 6-7 6-4 scoreline despite a terrific performance from his younger opponent.
Title holder and top seed Przemec Stec made light of a wrist injury to beat Ben McClurg 6-3 6-2 in an all-Windsor tussle while last year's beaten finalist Alex Watt (Hilden) had a 6-4 6-1 win over Michael Blease.
Defending ladies champion Lucy Octave made a successful start to her campaign as she defeated Megan Chambers 6-3 6-2 in the quarter-finals while Mary Parkash progressed to the last eight with a 6-4 6-2 victory over Emma Dornan.
Men's championship singles: Caleb Ralston bt Henrik Enoksen 7-6 6-4; Aaron Stubbs bt Jordan McKeown 6-3 6-7 6-4; Alex Watt bt Michael Blease 6-4 6-1; Ross McCarey bt Stephen McCausland 6-3 1-0 ret; Przemec stec bt Ben McClurg 6-3 6-2.
Ladies championship singles: Mary Parkash bt Emma Dornan 6-4 6-2; Lucy Octave bt Megan Chambers 6-3 6-2.