This, indeed, was done with McIlroy still feeling the effects of the food poisoning which had first surfaced in the early hours of Thursday morning.
We've already had so many hole-outs this week at the WGC-Mexico Championship.
Playing in his first tournament since mid-January after being sidelined with a rib injury, McIlroy recorded an eagle for the second straight day to go with six birdies in moving to 9-under 133 through 36 holes.
At one under, Marcus Fraser is the leading Australian on day two, while Sam Brazel is two over for the tournament.
McIlroy made eagle with a nine-iron from 151 yards at the par-four 14th and would have enjoyed a commanding halfway lead had his putter not gone cold at the end.
McIlroy leads ahead of the others after the conclusion of two rounds, while Phil Mickelson is tied second on the charts with Ross Fisher and Justin Thomas for company.
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McIlroy himself is suffering from the same stomach complaint that saw Phil Mickelson's brother take over as caddie after Jim "Bones" Mackay was forced into a quick dash back to the clubhouse.
Fortunately for Mickelson, his brother Tim had been alerted to the problem and was on hand to take over on the bag, with the pair combining for a 68 containing four birdies and a solitary bogey.
"Look, I'm in a great position", he said.
"Starting the day I would have taken 65, but I feel like I could have been a few more ahead", McIlroy told Golf Channel after posting a nine-under 133 total.
The Irishman will reclaim top spot in the world rankings for the first time since August 2015 by winning his third World Golf Championship title, as long as current number one Johnson finished joint fourth or worse. "My body is in great condition and if I keep playing well, I have a chance going into the weekend".