Mickelson has always been a fan favorite at Quail Hollow and usually plays well in the Wells Fargo Championship held in Charlotte.
But the 24-year-old American had to recover from three over par with three holes to play to card a one-over-par 72. "I feel like I have the game to compete in majors and tons of 30th- to 40th-, 50th-place finishes".
Furthermore, his career record at Quail Hollow has been impeccable.
Matsuyama was among the tournament favourites after a final round 61 saw him win the WGC Bridgestone Invitational last week and he justified that tag to move to eight under overall.
Rickie Fowler, still trying to get his first major, had a one-under 70 and is at three-under 139.
Clubhouse leader Olesen curled in a 25-foot birdie at the last to set the pace. As he was wrapping up his round, he saw a leaderboard that showed Kevin Kisner at 8 under for the tournament, and suddenly McIlroy's bid to end a three-year drought in the majors became that much more hard.
The other New Zealander in the field, Danny Lee, will miss the cut after a horror second round, carding a seven-over 78 to follow a five-over 76 in the first round. Find out all that and more on Saturday and Sunday at Quail Hollow. It's playing much faster and much firmer than it normally does at the Wells Fargo Championship. Some were good putts, some weren't. "You know who said that?"
"Is there any reason to think he won't hit the ball that well for the rest of the week?" I'm just losing focus on every shot.
"Some of the putts that I had for birdie are really one out of five to make".
"The golf course is an absolute brute this week". I have great practice sessions.
"When I had the chances that I had and I just couldn't get the ball to go in on the greens, that is when I get the most frustrated I can get out there", Spieth said.
One stroke adrift were US Open victor Brooks Koepka and fellow Americans Gary Woodland, Grayson Murray, Chris Stroud and D.A. Points.
Spieth, who also won the 2015 Masters and US Open, can become only the sixth man to sweep the four current major titles in a career after Jack Nicklaus, Tiger Woods, Ben Hogan, Gary Player and Gene Sarazen.
The grouping of Phil Mickelson, Jason Dufner and Jimmy Walker combined to shoot 23 over par during the first two rounds.