For the second straight day, Andrew Loupe leads the Wells Fargo Championship, but two household names are lurking just three shots back. Here's how things stand through 36 holes at Quail Hollow:
What it means: Fowler picked up his first PGA Tour victory at Quail Hollow in 2012 and is in search of his first PGA Tour victory since last September. Mickelson, meanwhile, is looking for his first victory of any kind since his triumph at the 2013 Open Championship. At the top of the board, Loupe, who won the Web.com Tour's Nationwide Children's Hospital Championship last September, is in search of his first PGA Tour victory.
Round of the day: Castro made seven birdies, three bogeys and an eagle en route to a 6-under 66. He made only three pars on each nine. The 31-year-old has two top-10s this year, a tie for eighth at Pebble Beach and a tie for fourth at the Sanderson Farms, as he works to make the postseason for the first time since 2013.
Best of the rest: Hadley made seven birdies and a lone mistake, when he three-putted for bogey at the par-3 third. Otherwise, he was flawless, pouring in four back-nine birdies for a second-round 67.
Biggest disappointment: Defending champion Rory McIlroy was 5 under on his round and had gotten to within four shots of the lead before a bogey-bogey close resulted in a disappointing 3-under 69 that has him six shots back heading into the weekend. Some notable names to miss the 1-over cut include Ollie Schniederjans (+2), Bryson DeChambeau (+3), Henrik Stenson (+3), Bill Haas (+3), Shane Lowry (+3), Kevin Kisner (+3), Ben An (+4), Justin Thomas (+4), the returning Jim Furyk (+4), and Webb Simpson (+5).
Shot of the day: McIlroy's chip-in for eagle at the par-5 seventh kicked off an eagle-birdie-birdie stretch for the Ulsterman who played Nos. 7-9 in 4 under par.
Quote of the day: "Going forward I'm going to do my best to not let my emotions get in the way out on the golf course, and I'm going to learn from this mishap and move on." - Zac Blair, who was disqualified for putting out with a putter he had broken on his head.