Lance Shatri made a winning club debut for St Gerards as their lone representative on the Crawley show.
The 17-year-old amateur from the Chichester-based club was up against a home boxer at the Goffs Social Club in the town.
The heavyweight weighed in at 86kg against 18-year-old Scott Livingstone, who came in at 87.5kg.
Livingstone had a previous win on his record as the pair met in three two-minute rounds bout.
St Gerards coach Gerry Lavelle admitted it had been a gamble taking the match-up.
He said: “We only took the contest at two days’ notice as Scott’s planned opponent had dropped out.
“Lance has been chomping at the bit to get out in competition and we decided to go for it as we felt he was ready.”
He added: “I told Lance too relax and enjoy the experience as he was very hyped up for the contest.
“Lance is a very dynamic power puncher, especially for his young age, so I knew his debut would be interesting with his come forward style of boxing and he would be chasing his opponent down.
“Competition is very different to all the rounds of sparring we do in preparation for the real thing.”
Shatri tried to cut off the ring and pin Livingstone down, who tried to box at long range and use his height advantage.
The southpaw landed with some good early shots but Shatri responded as the round wore on and scored with some heavy backhands.
A three-punch combination saw Shatri’s knees dip and he was given a standing eight count before getting extra time as his gumshield was washed after coming out in the flurry of punches.
Shatri was quickly back on his opponent as the bout resumed and a flurry of punches saw the referee jump in and halt the contest to give the St Gerards boxer a stoppage win.
Livingstone suffered a left eye injury in the onslaught.
Coach Lavelle added: “Lance was amazing in his debut and will continue to improve with more suitable competition. He is a work in progress and is learning all the time. He is a very bright prospect although he still very much a raw novice. I believe he can go far.”