Rory McIlroy apparently plays dynamic golf when he's not at 100 percent.
Johnson carded a 66 to end the day in a share of fifth place with Andy Sullivan and Daniel Berger, Sullivan holing his approach to the ninth for an eagle before adding birdies on the 11th, 15th and 16th in a superb 65.
On nine-under after a seven-under 65, McIlroy looks remarkably composed considering this is his first competitive action in seven weeks following a rib injury.
LPGA: Inbee Park birdied the last hole to take a one-stroke lead over Michelle Wie and two others at the LPGA's Women's Champions in Singapore.
In a week where we've seen chip-in eagles, hole-outs from the fairway and birdies from all kinds of distances, Thomas delivered arguably the best of the lot at the par-three 13th tee box.
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Mickelson proceeded to post a 68 for a seven-under total but even his renowned brilliance was only good enough to put himself in a tie for second for England's Ross Fisher on seven-under, with McIlroy enjoying a two-shot lead.
The theme of dodgy stomachs extended to caddies, with Mickelson's long-time bag man, Jim "Bones" Mackay, lasting only four holes before succumbing to serious discomfort.
"I was having breakfast and Phil called and said just be around if something happens", Tim Mickelson said.
"But I do feel I could have been a few more ahead. But my brother's a great player, and he did a phenomenal job (Friday)". "My body is in great condition and if I keep playing well, I have a chance going into the weekend".
The 27-year-old still arrived in Mexico City knowing that he could reclaim top spot in the world rankings for the first time since August 2015 by winning his third WGC title, as long as current number one Dustin Johnson finishes joint fourth or worse.