Martin came from sixth on the grid to score his ninth sprint win of the 2023 season.
With title rival Francesco Bagnaia only fifth after struggling on his medium rear tyre, Martin has cut the championship deficit down from 21 points to 14 ahead of Sunday's grand prix finale.
When asked by Autosport if this was the ride of a champion, Martin said: "No, no, I don't think so.
"I think I did an amazing job and I had big balls today because my feeling was so bad with the front, with the rear.
"But I pushed to the limit every corner to fight for that victory, so that's what I was so, so happy.
"I need to be happy about the result again and be proud about our job, because tomorrow we don't know what's going to happen."
Explaining why he felt bad on the bike, Martin said: "I think I was riding alone all morning, so I was feeling I could manage to understand how to ride, being really smooth with the tyres and I was making really good pace.
"But when you are behind and you have to push more than you think and change the lines, it becomes really complicated.
"I think also behind people, everything gets hot and nothing works. But when I was in front it was much easier. I don't feel 100% confident, but when I was behind I felt much worse."
Source: Autosport