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.
|I felt like Benjamin Button – Ibrahimovic misses ´fantastic´ Pogba and Man United team-mates|
|I should have faced Mourinho – Casillas rues Real Madrid fall-out|
|Kubica handed Williams drive for 2019|
|Hansen rings the changes for Italy clash|
|Zabaleta: West Ham need Nasri´s quality|
|Atletico Madrid v Barcelona: 2018-19 signings compared|
|Guardiola can repeat Barcelona success at Man City - Xavi|
|Harris not worried about previous Langer criticism|
|Blazers routed by Bucks, Warriors lose again|
|Nowitzki looking at December return after long recovery from ankle surgery|
|Australia, England and South Korea share World Cup of Golf lead|
|Warm welcome from Cavs ´means a lot´ to LeBron|
|LeBron helps Lakers past Cavs in Cleveland return|
|Guardiola: Premier League has improved me as a manager|
|WATCH: Cavs´ tribute video for LeBron does him justice in return to Cleveland|
|Harris, Tremain earn Australia Test spots|
|Mourinho would´ve won titles at Man City – Drogba|
|Cowboys WR Gallup set to play on Thursday after death of brother|
|Sutton re-signs with Rabbitohs for 2019|
|Chelsea legend Drogba confirms retirement at 40|
|England on track to be the world´s best in Tests - Root|
|Aubameyang ´trying to get fit´ for Bournemouth clash|
|Tenerife streak halted by PAOK as Bologna roll on|
|FIFA president Infantino pledges best ever World Cup in Qatar|
|India favourites after ´one of the worst years´ for Australia - Warne|
|Klaassen: Impossible to compare me to Kroos, Xavi|
|Guardiola eyeing future international job|
|Trubisky doubtful for Bears´ Thanksgiving game|
|O´Neill planning ´next adventure´ after leaving Republic of Ireland|
|Premier League: Brexit should not be used to weaken squads|
|16 balls, 14 boundaries, 74 runs - Shahzad steals show in T10 opener|
|WATCH: Patrice Evra plays with poultry in bizarre Thanksgiving message|
|Packers star Rodgers pledges $1m to California wildfire relief|
|Klitschko worried for boxing´s Olympic future|
|Lewandowski back in Bayern training as Davies joins new team-mates|
|Hogg fit for much-changed Scotland|
|Former Arsenal striker Bendtner faces 50 days in prison over taxi driver assault|
|Athletic extend Muniain contract to 2024|
|Kohli ready to move on after narrow defeat|
|PSG to wait for Neymar, Mbappe injury updates|
|Icardi hopeful of Messi return for Copa America|
|Cavs star Love expects to be out until 2019|
|Ricciardo terrified by Renault switch|
|Under-fire Taylor calls for PFA structure review|
|McLaren reveal one-off livery for Alonso´s last race|
|Samir Nasri training with West Ham amid reports of free transfer|
|Guardiola warned over derby clash comments|
|Stoinis sees Australia to T20 win against India|
|Modric not deserving of Ballon d´Or – Cavani|
|F1 Raceweek: Alonso ends on 312 races, Raikkonen a Ferrari great - Abu Dhabi GP in numbers|
|Neymar made a mistake leaving Barcelona for PSG, insists Edmilson|
|O´Neill and Keane leave Republic of Ireland after relegation|
|WATCH: Maxwell hits Spidercam with sliced shot in Australia-India T20|
|Rafinha wants Barca exit due to ´crazy´ Valverde selections – Mazinho|
|France to wear rainbow laces in support of Thomas following attack|
|You need to stop this – Cavani slams media over supposed Neymar feud|
|Anderson rested for final Test|
|Tite applauds Seedorf for Cameroon´s style of play|
|Griezmann not obsessed with Ballon d´Or|
|Neymar feels injury is ´nothing serious´|
|Durant says Green altercation won´t impact his free agency|
|Morris blasts drama surrounding Wizards: It´s messed up|
|Scaloni thrilled for Dybala, Icardi|
|Green´s last-second shot keeps Raptors atop East standings|
|Deschamps praises Griezmann for Giroud gesture|
|Warriors star Curry improving, still out at least three more games|
|Chile 4 Honduras 1: Sanchez, Vidal shine for La Roja|
|Argentina 2 Mexico 0: Icardi, Dybala score first international goals|
|Mickelson calls Tiger the greatest of all time|
|Durant fined $25,000 for using inappropriate language|