Dean Cosker hailed a "fantastic team performance" after Glamorgan recorded their highest Twenty20 total to beat Surrey by 25 runs at the Oval.
Colin Ingram hit 91 as Glamorgan posted 240-3 before Surrey were bowled out for 215.
Cosker claimed four wickets in the opening game of the T20 Blast.
"We posted a great score and 240 to defend at the Oval with a short boundary is going to take some doing," he said.
"We knew it was going to be tough because of the right hand, left hand combinations with the short boundary.
"But we did well - we put the ball in almost the right areas the majority of the time but luckily we picked up some key wickets during the middle.
"As long as you keep positive and try and take wickets through those middle periods we knew that we were going to restrict them and get that run rate going up."
Cosker's exploits at the Oval came a few days after he made a career-best 69 to help Glamorgan secure a County Championship draw against Kent.
Glamorgan begin their home campaign in the South Group next Friday against Essex at the Swalec Stadium and Cosker expects a big crowd following their win at the Oval.
"Hopefully the communication and marketing people at Glamorgan are doing their jobs nicely and getting a few people through the doors," said Cosker.
"We always get good home support and hopefully we can have a great crowd on Friday night against Essex."