And today he reached two under par and the first page of the leaderboard before eventually signing for a two-under 68 and one under standing overall.
Bookies Betfair revealed his astonishing drop in odds as the Northern Irishman eyes up a second Claret Jug.
But it could have been very different were it not for a little help from his friends on the 15th.
The four-time Major winner sprayed his drive wide and had to have officials dig up and move a sign with directions on it.
McIlroy was surrounded by fans as the workers made a clear path for the Northern Irishman.
Unfortunately for him, however, it still led to a bogey on one of only two par fives on the course.
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McIlroy's move sparked memories of when Tiger Woods had to call on spectators to move a boulder so could hit a shot.
And McIlroy said after his round: "I guess the spectator signage to where to go, they've bolted those into the ground and they needed to get an Allen key to remove it.
"They wouldn't give me a drop. I actually had an embedded ball there.
"Every other week we get relief from. But because we're playing with the R&A rules this week, we don't get relief from an embedded ball, so a double whammy."
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