Peter Malnati is among five players tied for the lead following the second round of the Shriners Hospitals for Children Open.
Malnati, Martin Laird (63), Patrick Cantlay (65), Brian Harman (63) and Austin Cook (65) share the one-shot lead through 36 holes at TPC Summerlin in Las Vegas.
Friday's five-way tie atop the leaderboard after two rounds is the most on the PGA Tour since the 2019 Masters.
American golfer Malnati surged into contention, rising 20 positions, with a stunning career-low nine-under-par 62.
A one-time PGA Tour champion but without a title since 2015, Malnati was bogey-free as he holed an eagle and seven birdies.
U.S. Open champion and 2018 Shriners Hospitals for Children Open winner Bryson DeChambeau is a stroke further back at 13 under heading into the weekend.
DeChambeau – the overnight leader – posted a second-round 67, having opened the tournament with a flawless 62 on Thursday.
Eyeing next month's rescheduled Masters, DeChambeau only dropped one shot on day two, recording two eagles and a birdie to stay in the hunt.
Former Masters champion Sergio Garcia is among the players tied for seventh at 12 under following his seven-under-par 64.
Defending champion Kevin Na, meanwhile, carded back-to-back 66s to be four shots off the pace.
However, it was not a good day for the likes of Rickie Fowler (74) and former world number one Jason Day (72) after they missed the cut.