But England's Tyrrell Hatton also reached 16 under thanks to birdies on the 12th and 14th and an eagle of his own on the 15th, while playing partner Mickelson birdied the 15th and 16th to make it a three-way tie.
"I don't know (when I'll get to 50)", Mickelson said. The youngest player at the tournament will be paired with one of the oldest, Phil Mickelson, in the final round on Sunday.
Five-time major victor Phil Mickelson defeated Justin Thomas in a play-off after an extraordinary climax to the WGC-Mexico Championship to claim his first victory since the 2013 Open. "Then he made a few putts and he came back to me and said, 'Have a good day.' It was nice".
He caromed two tee shots off carts paths in a three-hole stretch, hit a tree and "a bunch of people" along the way - exactly what we've come to expect from one of the game's most entertaining players.
"I had a bunch of putts that were really close and a lot of them lipped and burned edges". With so much at stake where a victory over the games top stars will be worth Dollars 1.7 million in prize money, an exemption onto the PGA TOUR through the 2020-21 season, 550 FedExCup points and starts in nearly every major championship including THE PLAYERS Championship this season, the talented Indian is looking forward to the final round.
Sharma was outside the world's top 450 when he won the Joburg Open in December, and he followed that up with victory in Malaysia last month.
"I'm definitely disappointed", he said.
Sharma was six when he went to a golf course for the first time and got hooked on the sport. Even golfers who play on the European Tour with Sharma are still unfamiliar with his rise up the rankings. "I found something in the practice rounds and I'm happy I'm rolling in some good putts".
"The nerves got me, maybe", Shin said. I'm very proud of myself.
Mickelson, who prior to Sunday hadn't won since the 2013 British Open, still sits at ninth on the all-time PGA Tour victories list, two wins behind Walter Hagen, 36 behind the only active player ahead of him, Tiger Woods, and 39 shy of leader Sam Snead, who won 82 times in his Tour career.
"I think it's the most maturity and kind of poise I've shown in a tournament I've ever played".