The 21-year-old became the first Indian to hold a 54-hole lead in a World Golf Championship, as he added a grinding two-under 69 to move to 13-under. For all the unknowns that come with Sharma, there's nothing but proven products lurking behind him.
"I got off to a great start", said Sharma.
Schauffele, the US PGA Tour's 2017 Rookie of the Year, is the only player with no bogeys after 36 holes, having opened with a 65 and followed with a 68.
And with last week's Honda Classic victor Justin Thomas four strokes behind, little wonder Sharma was rated only a 9/2 chance of winning by betting firm Centrebet.
Mickleson soon realised his error, apologised and wished him as he went to the first tee for the start of his round.
Another shot back was Dustin Johnson, the No. 1 player in the world and defending champion, who managed a 68 despite playing the par 5s on the back nine in 1 over. "I feel like the game's in really good form".More news: Signals From the First Stars Could Show Hints of Dark Matter
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An eagle on Friday at the short par-four first hole, where he drove the ball to inside two feet for a tap-in, changed that and bogeys at the next two holes proved minor setbacks. And it wasn't long enough for DJ, who chose to take a ridiculous line off the tee during Friday's second round.
In the morning five-time Major victor and Hall of famer, Mickelson, initially mistook him for a fan or a journalist and waved Shubhankar off at the practice green before the start of the third round, thinking he was a member of the media.
"But overall if you had said I was going to shoot seven under at the start of the day, I would have been buzzing". "Phil is a legend", he said. The Asian Tour Order of Merit leader maintained his two-shot lead at the Club de Golf Chapultepec in Mexico City after the third round. For context, consider that when Sharma was born, Lefty already had 113 starts, eight wins and 25 top-10s on Tour.
Phil Mickelson played bogey-free for a 65 that will put him in the last group with Sharma and Tyrrell Hatton of England, who had a 64.
Coetzee is looking for a fourth European Tour title and a second at the Tshwane Open after winning this event in 2015. "Made a few mistakes coming in, but I've done a fairly good job of the distances and the yardages". "I think it just pushes guys like me to play even better".
But first he'll have to outduel Sharma, whose most vivid images of the game are watching major championships as a child into the early hours back home in India.