A blistering front nine helped Erik van Rooyen shoot a six-under 66 on Saturday to take control of the Irish Open.
The South African had shared the overnight lead at Ballyliffin Golf Club, but a run of three birdies in his first four holes, and three in succession between seven and nine, saw him reach the turn in just 29.
No further birdies followed on the way in, but the 28-year-old also avoided any blemishes to sit at 14 under for the tournament, giving him a four-stroke lead in outright first ahead of Sunday's final round.
Van Rooyen has already qualified for the Open Championship, which starts on July 19.
However, the three leading players not otherwise exempt who finish in the top 10 and ties will earn a spot in the field for the third major of the year at Carnoustie.
Among the hopefuls are Sweden's Joakim Lagergren and Ryan Fox of New Zealand, who are tied for second at 10 under.
A third round of 70 saw Fox give up a share of the lead, while Lagergren's 69 kept him in contention.
Frenchman Matthieu Pavon, the other member of the three-way share for top spot after Friday's second round, struggled to a one-over 73 and is now tied for sixth, along with countryman Raphael Jacquelin and England's Lee Westwood.
Ahead of them, 2016 Masters champion Danny Willett and Scotland's Russell Knox, who, like Westwood, have already qualified for The Open, are outright fourth and fifth respectively.
Andy Sullivan's seven-under 65 was the low round of the day, and he was joined by Spaniard Jon Rahm in a share of ninth at six under.
Rory McIlroy again underwhelmed, the four-time major winner's 72 leaving him one under for the event.
21. Juli 2018
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|Hamilton not giving up despite Hockenheim heartbreak|
|Spieth surges into Open Championship lead|
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|Tiger Woods in the hunt and loving it at The Open|
|Vettel delighted with German GP pole performance|
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|Prowling Tiger Woods on Open charge as Spieth joins leaders|
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|Hamilton expecting tough Sunday at Hockenheim|
|Spalletti expects Icardi, Perisic to stay at Inter|
|Vettel smashes lap record to take Hockenheim pole after Hamilton woe|
|Warner targets Australia recall after Darwin debut|
|Rose: Open Sunday will be ´interesting´ after 64|
|Hamilton out of German GP qualifying as Mercedes falters|
|Pogba, Mbappe, Griezmann? Deschamps mulls Ballon d´Or contenders|
|Farah concussed on 250th Wests game as Tigers stun Souths|
|Waratahs overrun Highlanders in stunning second-half fightback|
|Rose scores record-equalling 64 to jump into Open contention|
|Moreno hails Liverpool´s recruitment drive as ´top, top players´ arrive|
|AC Milan elect new board with CEO Fassone out|
|Sri Lanka grind sorry South Africa into the Colombo dirt|
|Mina ready to reject offers for Barcelona stay|
|Guardiola tells Sane to use World Cup snub as motivation|
|Golovin´s ex-team-mate Chepchugov drops hint over Chelsea move|
|Reed & Rose make early charges on Carnoustie ´moving day´|
|Sancho ´had a point to prove´ in Dortmund´s win over Manchester City|
|Li hits back at AC Milan owners Elliott as bitter split continues|
|Crusaders cruise past Sharks to book Hurricanes semi-final|
|Rabiot would be a great signing for Barcelona – Xavi|
|JaVale McGee: Lakers are going to be ´one of the most fun teams ever´|
|Dolphins owner Ross: National anthem policy a ´placeholder´|
|Boga leaves Chelsea for Sassuolo|
|Schurrle in talks to leave Borussia Dortmund|
|Guardiola happy with Mahrez and Man City despite loss|
|Dodgers top Brewers in Machado´s debut|
|Raptors GM apologises to DeRozan after Spurs trade|
|Manchester City 0 Borussia Dortmund 1: Gotze spoils Mahrez´s debut in ICC opener|
|United fans keeping De Gea at Old Trafford – Herrera|
|Keita: I turned down Barca and Bayern for Liverpool|
|Merritt stays ahead as rain halts Barbasol Championship|
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|Donald Trump: Kneeling players should be suspended without pay|
|Cardinals´ Carpenter makes history|
|Nationals pair Strasburg, Zimmerman activated from DL|
|Premier League-linked Plattenhardt feels at home at Hertha|
|Johnson expecting tough Granollers challenge|
|Good Luck at last! Colts quarterback fit for training camp|
|Haase humbles Rublev as Cecchinato charges on|
|Benzema hits back at ´crazy´ De Laurentiis over age jibe|
20. Juli 2018
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|No freaky Friday for Spieth as he bounces back in round two|
|Double boost for Bouchard in Gstaad|
|Iconic Ronaldo to raise Serie A level - Roma´s Hamm|
|Brighton birthday boy March renews contract|
|Lamela hoping injuries are behind him after signing Tottenham extension|
|Where will I get my massage? - Roma´s Pallotta mocks UEFA ban|
|Rashid struck by Lightning amid speculation over Test recall|
|Major misses a mixed blessing for Fowler and Kuchar|