And it was all down to Paddy Kenny - that's what he's saying and he's sticking to it.
The former Sheffield United goalkeeper didn't concede a Ronaldo goal in two matches across the 2006/07 season, although, he really should have done.
Manchester United did win both encounters that season, but a shocking miss could have cost them dear.
Just 13 minutes into their match 15 years ago, Blades star Keith Gillespie put the home side ahead with a glancing header to connect with Derek Geary's cross.
Manchester United did come from behind to beat their opponents 2-1, with Wayne Rooney's brace proving to be the difference between the two sides.
But it was a forgettable afternoon for Portuguese superstar Ronaldo who, somehow, failed to convert into an almost empty net from four yards out.
Ryan Giggs slipped a low pass to an unmarked Ronaldo, who had the simplest of tap-ins, but he spooned his strike over bar.
Speaking to The Star, Kenny was asked whether the third-time Premier League champion should have scored against him and said: "He definitely should have.
"I get people mentioning the Ronaldo miss to me all the time.
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"I tell them that I put him off! He had one eye on the fat cat, flying back across goal at him!
"It's still a good memory, though - I had two games against one of the world's best that season, and he didn't score. Even if he should have!"