Sweden's Henrik Stenson is the clubhouse leader at six under par after firing a second successive round of 67 in the PGA Championship at Baltusrol on Friday.
The Open Championship winner made front nine birdies on the first, third and eighth holes and followed that up with a birdie on the 18th, with his only dropped shots coming on the 12th and 13th for his three-under 67.
A shot behind are Germany's Martin Kaymer and American Patrick Reed. Kaymer posted a solid 69 while Reed's superb 65 was the low round of the day so far.
American world number three Jordan Spieth is a shot back at three under after a three-under 67. Spieth was four under on his front nine, but could only play the back in one over.
Overnight leader Jimmy Walker is among the late starters which include the grouping of Rory McIlroy, Jason Day and Phil Mickelson.
The 44-year-old’s last appearance on the PGA Tour was in mid-February.
The biennial match between the United States and Europe will now take place in September 2021 at Whistling Straits.
Organisers hope to stage the event in September 2021.
The five-time European Tour winner has yet to register a victory in the United States.
The event at Royal Troon from August 20-23 will now be the first women’s major of the year following the cancellation of the Evian Championship.
Bryson DeChambeau hopes his victory at the Rocket Mortgage Classic on Sunday has answered his critics.
Overnight leader Matthew Wolff was not able to recover from a poor start.
Americans Ryan Armour and Bryson DeChambeau sit in second place.
The Englishman carded a 66 to put behind him the disappointment of playing alone and missing the cut last week.