Jorge Lorenzo admits he was desperate to beat Yamaha team-mate Valentino Rossi at Aragon as "it would have been almost impossible to win the Championship" had he failed.
The pressure was on the Spaniard heading into Sunday's race as he was 23 points behind Rossi in the standings on the back of his retirement at Misano last time out.
And he duly delivered as he was faster than his team-mate all weekend, going on to win Sunday's race at MotorLand Aragon to close the gap to the Italian to just 14 points with four rounds still remaining.
Lorenzo, though, admits he needed a bit of luck to pull away from pole-sitter Marc Marquez from Honda early on, but it was plain sailing after that.
"I took a big sigh of relief, because I was pushing so much and my tension-level was very high," he said.
"I was trying to pull away by some metres from Marquez. I knew it was going to be difficult because my pace was very similar to his and after the warm up I knew his pace was very strong.
"We probably would have fought all the race and he may have beaten me in the final part because he may not have noticed the drop of the tyres as much, but I was lucky.
"This race was very important to forget about the last two races with bad luck concerning the weather and where I made some mistakes.
"Had I lost more points to Valentino, it would have been almost impossible to win the Championship.
"Now it's a bigger chance, but you never know what happens at the three fly-away races, so we have to keep our feet on the ground and keep working well as we are doing now and try to beat the others on all laps of these next four races."