Jason Kokrak earned a record lead at the AT&T Byron Nelson as two-time major champion Jordan Spieth sensationally missed the cut.
Kokrak was the star performer on Friday after carding an almost flawless eight-under-par 62.
The American's performance saw him move five shots clear to 12 under atop the leaderboard – the greatest 36-hole lead at the PGA Tour tournament since David Love III's four-stroke advantage in 2000.
Billy Horschel (65) is second heading into the weekend, but world number one Dustin Johnson is lurking in Irving, Texas.
U.S. Open champion Johnson posted back-to-back 67s to be tied for third at six under following the second round.
Teeing off on the back nine, Johnson was flawless as he birdied the 18th before adding another three consecutive birdies from the fifth to the seventh at Four Seasons Resort and Club Dallas.
Johnson would have been five shots adrift had he not bogeyed his final hole.
An Byeong-hun (66), Cameron Tringale (68), Bud Cauley (67), overnight leader James Hahn (70) and Jhonattan Vegas (68) are also six under.
Former world number one Jason Day is nine shots behind Kokrak following his second-round 69.
Masters winner and defending champion Sergio Garcia posted a five-under-par 65 to be two under through 36.
However, it was a day to forget for Spieth after he farewelled the tournament.
Spieth fired a five-over 75 with a quadruple-bogey nine on the par-five 16th hole as he missed the cut for the third time in four starts.
Spieth was well inside the cut line before the implosion that forced him to re-tee twice.
|Yankees´ home runs fuel win over Rangers|
|LeBron scores 44 points as Cavs level series against Celtics|
|Kaufusi re-signs with Melbourne Storm|
|LeBron James sets record for postseason field goals|
|Monchi: Alisson will only leave Roma if I come out of retirement!|
|No offers from Chelsea or Zenit, says Sarri´s agent|
|No Champions League pressure as PSG´s Tuchel calls for patience|
|Nationals´ Juan Soto hits homer in second career at-bat|
|Buffon to decide future in a week amid PSG speculation|
|Eli Apple embarrassed by 2017 antics, ready to move forward|
|Bills release Richie Incognito from reserve/retired list|
|Gentry and Pelicans want Cousins back in New Orleans|
|MLB extends Blue Jays closer Osuna´s administrative leave|
|Lloris, Jedinak and Kjaer ask FIFA to allow Guerrero to play at World Cup|
|Wolfsburg preserve Bundesliga status after play-off win over Kiel|
|Zidane was my idol and always will be - Wijnaldum|
|Liverpool ready to fly out of the blocks in Kiev - Henderson|
|Montreal Impact 0 LA Galaxy 1: Ibrahimovic sent off for slapping opponent|
|Real Madrid v Liverpool: Salah, Ronaldo lead the line in combined XI|
|Bertens keeps hat-trick hopes alive in Nuremberg|
|Monfils and Mannarino fail to fly the flag in Lyon|
|Morata, Fabregas, Herrera and more in Spain´s World Cup rejects XI|
|Reina to face FIGC hearing|
|Emery set to be appointed by Arsenal - reports|
|LeBron ´appreciative´ of hometown effort to put up statue of him|
|Cazorla leaves Arsenal after injury nightmare|
|Derby´s Rowett seeks permission for Stoke talks|
|Messi physically and mentally ready for the World Cup, Sampaoli proclaims|
|Murray expected to return at Rosmalen Grass Court Championships|
|More to Madrid than just Ronaldo - Robertson|
|Wolff: Red Bull and Ferrari favourites in Monaco|
|Iniesta hailed by Xavi as ´the most talented player in the history of Spain´|
|If you Googled ´European nights´, Liverpool would be top result - Klopp|
|Icardi cut from Argentina World Cup squad|
|Test recall a ´fantastic surprise´ for Buttler|
|Klopp needs Premier League to be a Liverpool great – Johnston|
|Salah is ´definitely´ world´s best - Lovren|
|Rhinos captain Watkins ruled out for eight months|
|No clue - Klopp defiant over Can to Juventus claims|
|Younis tips Babar for Pakistan greatness|
|Germany squad numbers hint at World Cup good news for Neuer|
|WATCH: Moto3 rider makes spectacular jump over crashed rival|
|Leaving out Morata ´painful´ for Spain boss Lopetegui|
|Gustard to leave England role for Harlequins|
|Nainggolan retires from Belgium duty after World Cup snub|
|Spain striker Morata misses out on World Cup selection|
|LeBron or Kawhi could lead Lakers to the Finals - World Peace|
|Serena steps up Roland Garros training ahead of French Open|
|Nainggolan left out of Belgium´s World Cup squad|
|The long goodbye: Iniesta sits alone in Camp Nou after final Barcelona match|
|Wane to leave Warriors at end of season|
|Dr Fury will see you now - Tyson plans future career in medicine|
|Harden, D´Antoni rue ´soft´ Rockets performance in Warriors drubbing|
|Liverpool players can change their lives in Kiev, says Gerrard|
|Real Madrid v Liverpool: Can great deeds of the past fuel the bid for Champions League glory?|
|Wash your mouth out! - Curry´s expletive outburst earns scolding from mother|
|Rakitic lost for words as Iniesta heads for Barcelona exit|
|Conte: Chelsea must overhaul squad to change style|
|Johnston: Liverpool can´t lose Suarez, Coutinho and Salah!|
|Messi: I like Griezmann, he´s one of the best|
|Ohtani says he´s not good enough for Home Run Derby yet|
|Mendy: France are eyeing World Cup glory|
|Scott accepts two-week ban for Walker punch|
|Braves rally for six runs in the ninth to defeat Marlins|
|MLS Review: Red Bulls upstage Atlanta thanks to Wright-Phillips brace|
|Warriors breeze past Rockets in game three|
|We have a quality squad – Man City chairman hints at caution in transfer market|
|Wise cruises to maiden PGA Tour victory at Byron Nelson|
|Matic: United can fight for Premier League and Champions League with experience|
|Golden Knights GM on Stanley Cup Finals berth: I don´t know how we did it|