Keenan Davidse hit nine birdies to card a sensational 63 and take a one-shot lead after the opening round of the Joburg Open on Thursday.
The 28-year-old took advantage of playing the shorter Bushwillow course to finish eight-under, and his day could have been even better had he not bogeyed the par-three sixth.
Davidse had been in hospital for four days in the build-up top the event at the Randpark Golf Club but he shrugged off the flu to set the pace on home soil.
He was three-under by the time he reached the sixth, and after that dropped shot he never looked back, birdieing five of the back nine to reach the clubhouse in fine fettle.
"I'm obviously very happy," he said. "I've worked very hard. I went to Mauritius last week and didn't play too well. I was in hospital for about four days, so I'm very chuffed today.
"When I played the Sunshine Tour event at Simola my little boy was sick with a bad chest. Then my wife had flu and then I got flu and lost a lot of weight. I couldn't deal with that and the heat in Mauritius, so I checked myself into hospital for four days.
"I didn't really have any expectations coming into the week. I'm just out here to have fun, obviously, so I'm very blessed to be playing well.
"It's always nice leading a big tournament and especially the Joburg Open. I needed to play well today - it's a good feeling."
Behind him, a group of six players are well placed on -7 after they too flourished on the Bushwillow 18, Matthew Baldwin claiming two eagles in the hunt of Davidse.
He is joined by James Morrison, Sebastian Heisele and South African trio Jared Harvey, Erik Van Rooyen and Ockie Strydom.
The leading seven players will take to the Firethorn course on Friday hoping to maintain their form.
Six-under was the best any player who tackled the second course could manage, Dean Burmester one of another six to sign for a 66.
Things were not so good for defending champion Darren Fichardt, though, as he could only finish in 75, leaving him well adrift.
|Manchester United v Juventus: Ronaldo out to end dismal scoring record against Mourinho|
|Injured Ribery to miss Bayern´s clash with AEK|
|Wilshere would have stayed at Arsenal under Wenger|
|Mahomes stars again as Chiefs crush Bengals|
|Bolt must accept ´much less´ to join Mariners, says A-League chief|
|Klopp compares Liverpool to dog without favourite toy|
|Young leads Hawks to first win, Thunder fall in Westbrook´s return|
|Spalletti hits out at physical Milan – I had three players asking to be replaced|
|Cowboys, Ravens lose after missed kicks in final seconds|
|Hernangomez secures Nuggets´ win over Warriors with last-second block|
|Hasler returns to Manly on three-year deal|
|Sarri: Chelsea fans must respect Mourinho|
|Ronaldo learnt from Scholes – Pjanic praises Juventus star|
|CA dismisses spot-fixing claims|
|WATCH: Will Ferrell leads chants with LAFC fans|
|MLS Review: Galaxy on track for play-offs as Timbers, DC clinch spots|
|Elliott secures win at Hollywood Casino 400|
|Thunder´s Westbrook makes season debut against Kings|
|Saints beat Ravens after Tucker misses extra point|
|Rondo, Paul and Ingram banned after Lakers-Rockets fight|
|Saints QB Brees reaches another historic milestone|
|Biglia: VAR should have checked Nainggolan tackle|
|Gattuso not blaming Donnarumma for derby defeat|
|Seventh in Mexico will secure Hamilton´s fifth world title|
|Rooney fires DC United into MLS play-offs|
|Alonso slams ´amateur´ F1 rivals after latest crash|
|Spalletti fears lengthy Nainggolan absence|
|To the Max! Verstappen destroyed shoe fending off Hamilton|
|Icardi delight after Donnarumma error gives him another derby winner for Inter|
|Guardiola: Versatility the key for Stones|
|Vettel frustrated as mistakes continue to hamper title challenge|
|ECB refutes spot-fixing claims against England players|
|I thought we would do better - Hamilton queries Mercedes strategy|
|Inter 1 AC Milan 0: Icardi settles derby with dramatic late winner|
|Hamilton denied title party as Raikkonen wins in Austin|
|Patriots RB Michel out against Bears with gruesome knee injury|
|Kohli hails Rohit partnership after comprehensive India victory|
|Silva downplays his role after Everton super subs seal victory|
|Injured Bairstow out of final white-ball matches in Sri Lanka|
|Pliskova feeling confident after impressive start in Singapore|
|Big-hitting Imrul rescues Bangladesh in opening ODI|
|Leinster suffer late defeat at Toulouse, Newcastle snatch dramatic victory|
|Chargers pip Titans to dramatic London win|
|Everton 2 Crystal Palace 0: Substitutes Calvert-Lewin and Tosun clip Eagles´ wings|
|Thunderstorms push Andalucia Valderrama Masters into reserve day|
|Edmund masters Monfils to claim maiden singles title|
|Kohli and Rohit fire India to comprehensive ODI win|
|Manchester United didn´t play - David Luiz blasts Mourinho tactics|
|Svitolina out to silence ´haters´ in Singapore|
|Emre Can facing surgery on thyroid problem|
|Tsitsipas claims maiden ATP crown in Stockholm|
|Mariners boss Mulvey knows nothing of Bolt contract offer|
|WATCH: Vinicius Junior scores free-kick - then sees red!|
|Gronkowski ruled out of Bears clash|
|Khachanov enjoys home comforts with comprehensive Kremlin Cup win|
|Isner wants Wimbledon tie-break rule named after him|
|Hummels lauds ´outstanding´ Lewandowski|
|Liverpool´s defensive improvement no accident – Gomez|
|Pliskova overpowers defending champion Wozniacki in Singapore|
|Marquez dislocates shoulder celebrating MotoGP title|
|Henry taking positives from opening Monaco defeat|
|A-League Review: Mariners held as Bolt considers move|
|Dominant Svitolina ends Kvitova hoodoo in Singapore|
|Pereira warns Juventus to expect ´pumped up´ Manchester United|
|D´Antoni backs NBA to ´sort out´ Lakers-Rockets brawl|
|Mixed feelings for champion Marquez after Dovizioso crash|
|Bolt offered contract by Central Coast Mariners|
|Anthony accuses Rondo of spitting after Lakers-Rockets brawl|
|Martial insists he has good relationship with Mourinho|
|Bautista to replace Lorenzo at Phillip Island|