Fowler has already made a mark this week as his two-day 130 total tied the lowest 36-hole U.S. Open scoring record set by Martin Kaymer in 2014.
A little different once you get to after 54 holes because that's when things really heat up," Fowler said on Friday.
Fowler, who also held a share of the first-round lead with Schauffele, will have his work cut out with a leaderboard that features plenty of top-tier talent.
World number three McIlroy, who has gone nearly nine years since winning his fourth major title, will set off in the penultimate group alongside Schauffele two strokes off the lead.
World number one Scottie Scheffler, trailing Fowler by five, and British Open champion Cameron Smith, six back, were scheduled to go off at 2:56 PT.
Persons:
Rickie Fowler, Wyndham Clark, Rory McIlroy, Xander Schauffele, Fowler, Clark, Martin Kaymer, Schauffele, McIlroy, Lanny Wadkins, Scottie Scheffler, Cameron Smith, Jon Rahm, Canada's Adam Hadwin, Frank Pingue, Ed Osmond
Organizations:
U.S ., U.S, Los Angeles Country Club, Thomson
Locations:
ANGELES, Toronto