The 24-year-old University of Otago physical education student has been picked as a line umpire at the ATP world finals in London at the end of November.
He will be officiating all the top-ranked players but this is becoming second nature to Trifunovski, who started umpiring when he was 13.
It is the next step in a career which has included appearances at the US Open and the Australian Open, including a stint as line umpire in the epic five-set final in 2009 between Roger Federer and Rafael Nadal in Melbourne.
"That match just went on forever. But it was a great experience," he said.
"You've got a big crowd there - it can be a pretty hard thing to concentrate on. Players can see the ball different from what a line umpire can, and what a chair umpire can, but you have to make the call."
Trifunovski was born in Macedonia and moved with his parents to New Zealand when he was 7.
He had been a chair umpire in the junior rounds at grand slams and also in the early rounds of the Heineken Open and the ASB Classic.
A premier club tennis player in Dunedin for Eastern Harbour, Trifunovski, who comes from Auckland, said he did not train for the job as line umpire - it was just a case of concentration.
The criticism line umpires faced was human nature.
"It is just part of the game and you get used to it. I'm a tennis player too and know what it is like. Most players get fired up about things from time to time but they are all nice guys afterwards."
His father, Blaze, was a silver badge umpire, the second top tier umpires could aspire to, and had also umpired worldwide.
The younger Trifunovski first joined the umpiring ranks when there was a shortage of officials at the Heineken Open.
And he should not be too frazzled at the November event in London, which features the top eight male players in the world.
After all, he has been on the line when superbrat John McEnroe was playing.
"It was just an exhibition... against Pat Cash, I think, but he had to complain. He was putting it on really. But that is what the crowd expected, and wanted."
