Kevin Kisner held a one-stroke lead over Hideki Matsuyama and Chris Stroud midway through their third rounds at the US PGA Championship as players struggled to get moving.
A surprise co-leader through 36 holes, Kisner was one under through nine in his third round at Quail Hollow and sat clear of the field at nine under overall.
The American, without a top-10 finish in his major career, showed no signs of nerves and had other opportunities in fine conditions.
Matsuyama, who shot a stunning seven-under 64 in the second round, hit just two fairways on the front nine but was even for the day to be a shot back.
The other member of the final group - Jason Day - was one over in his third round, leaving him four off the pace.
However, the unheralded Stroud moved into a tie for second with Matsuyama after turning in two under.
Matsuyama, coming off a bogey-free round, dropped a shot at the first – a hole at which no birdies were made in the third round – missing a left-to-right six-footer after finding the left greenside bunker.
Day joined him in a tie for second at the next hole, a brilliant approach to within four feet seeing him birdie as Kisner and Matsuyama missed chances.
Kisner created birdie opportunities on each of the first three holes, and his perfect record from inside 10 feet at this tournament came to an end when he missed from seven at the third.
Day seemingly misread a four-foot birdie putt at the fifth before opportunities predictably arrived at the par-five seventh.
Matsuyama tapped in for birdie but Kisner, who almost found the water with his second, also picked up a shot to remain one stroke clear.
Day had eagled the hole the previous two days but had to settle for par after three-putting and the Australian then bogeyed the ninth.
Louis Oosthuizen was at five under with Day, while Rickie Fowler and Justin Thomas were a shot further back.
Spaniard Jon Rahm briefly made a move on Saturday and was five under through 14 before going five over on his final four holes.
Jordan Spieth's bid for a career Grand Slam is set to have to wait, the world number two shooting a 71 to reach the clubhouse at three over.
|Dodgers option Pederson to make room for Granderson|
|USA extend Solheim Cup lead|
|Stenson grabs third-round lead after late birdie barrage|
|Wenger: I´m not thinking about signing players|
|Holder: West Indies were totally outplayed by England|
|Halep sets up Muguruza Cincinnati final and closes on world number one spot|
|We never give up - Simeone lauds Atletico escape act at Girona|
|Buffon ´sorts out problems´ for Juventus - Allegri|
|Broad hails special moment as he overtakes hero Botham|
|Championship Review: Hourihane a hat-trick hero in Villa thriller, Cardiff and Ipswich stay perfect|
|Wenger defends Ozil, hopes to have Sanchez back against Liverpool|
|Dimitrov breaks new ground with Cincinnati win over Isner|
|Broad eclipses Botham as England storm to victory by an innings and 209 runs|
|Girona 2 Atletico Madrid 2: 10-man Atleti battle to draw after Griezmann sees red|
|Hughes lauds ´elite´ Jese after Stoke´s gritty Arsenal upset|
|Coetzee demands more from improving Springboks|
|We scored a goal – Wenger disagrees with Lacazette offside call in Arsenal loss|
|Who needs the ball? Stoke beat Arsenal despite lowest-ever 22.7% possession mark|
|Montella dismisses talk of Milan title challenge|
|Zidane hoping for a big season from Bale at Madrid|
|Pulis hails ´absolutely fantastic´ debutant Barry after win at Burnley|
|Arnautovic apologises to West Ham fans after red-card shame|
|We cannot look back - Valverde keen to move on from Neymar and Madrid disappointments|
|Stoke City 1 Arsenal 0: Jese hits winner in dream debut|
|Bilic upbeat despite West Ham heartbreak at Southampton|
|BMC impress with time trial win as Froome gains early Vuelta advantage|
|Spalletti determined to keep Candreva despite continued Chelsea speculation|
|No news on Coutinho despite reported new Barcelona bid, says Klopp|
|Juventus 3 Cagliari 0: Buffon saves Serie A´s first VAR penalty in comfortable win|
|Marvellous Muguruza ends Pliskova hoodoo to reach Cincinnati final|
|Richarlison link-up excites Watford record signing Gray|
|Valverde calls on Barca to support Messi after Suarez injury|
|Shakespeare targets more home comforts after downing Albion|
|South Africa 37 Argentina 15: Dominant Springboks maintain winning streak|
|Klopp ´completely happy´ as Liverpool battle to win over Palace|
|Carlsson breaks down Wall to set up Siem semi|
|Swansea in race against time to do ´good business´ after Sigurdsson exit|
|Southampton 3 West Ham 2: Austin settles five-goal thriller with late spot-kick|
|Bournemouth 0 Watford 2: Richarlison shines to inspire Hornets victory|
|Leicester City 2 Brighton and Hove Albion 0: Okazaki´s early opener sets Foxes on their way|
|Liverpool 1 Crystal Palace 0: Mane rescues Klopp from more Premier League frustration|
|Burnley 0 West Brom 1: Sub Robson-Kanu hits winner, then gets sent off|
|Lynagh slams schoolboy Wallabies´ display|
|Dominant All Blacks were seduced by scoreboard, says Hansen|
|Wolfsburg 0 Borussia Dortmund 3: Pulisic shines as Bosz makes ideal start|
|Mourinho insists United will not get carried away after dream start|
|Cheika confident Wallabies will be better after first-half horror show|
|Confident United an improvement on last season - Pogba|
|Dembele will only leave Dortmund for right price - Zorc|
|Seahawks left tackle George Fant out for season with ACL injury|
|Smith staying focused after Storm secure minor premiership, Cowboys´ woes mount|
|Swansea City 0 Manchester United 4: Mourinho´s men win big again after late goal glut|
|Gotze to make first Borussia Dortmund start in seven months|
|Juventus´ Keita pursuit ´practically a crime´|
|Read thrilled by ´awesome´ All Blacks first half in Sydney|
|Australia 34 New Zealand 54: All Blacks run riot before Wallabies rally|
|Zidane open to new Real Madrid arrivals before transfer window closes|
|Hoeness slams Barcelona´s Dembele pursuit as ´the lowest class´|
|Mahmudullah overlooked as Bangladesh recall Nasir and Shafiul|
|Liverpool star Mane has Diouf dilemma|
|Nadal offers condolences to victims of Barcelona tragedy|
|Alexander-Arnold should expect to spend time on the bench - Klopp|
|Kyrgios on Nadal victory: These matches aren´t the problem|
|Sigurdsson feared Everton deal would collapse|
|All Blacks flanker Kaino returns to New Zealand|
|Machado´s walk-off grand slam lifts Orioles|
|Portland Timbers 2 New York Red Bulls 0: Hosts bounce back in MLS|
|Nadal fails to reach Cincinnati semis, Thiem falls to Ferrer|
|Pliskova set for Muguruza semi, Halep wins through|
|Kyrgios stuns Nadal in Cincinnati quarters|