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.
|BREAKING NEWS: Argentina rule Romero out of World Cup|
|Emery´s website appears to confirm Arsenal appointment|
|´Inspiring´ Guardiola has made Fleetwood a better golfer|
|Two trophies in a week! Torres leaves Atletico Madrid in style|
|I died a thousand deaths - Yates set for Giro defensive after time trial|
|Hamsik hints at Napoli exit amid China rumours|
|Rowett swaps Derby for Stoke|
|Thiem comfortable in victory as rain delays Wawrinka|
|Schmelzer gives up Borussia Dortmund captaincy|
|Top seed Stephens struggling at Nuremberg Cup|
|This is the wrong information - Vieira rejects Nice speculation|
|France rest Guirado, recall Thomas for New Zealand tour|
|Warriors´ Iguodala upgraded to questionable for game four|
|Simmons, Mitchell unanimous picks for NBA All-Rookie first team|
|AC Milan referred over alleged FFP breaches|
|F1 Raceweek: Ferrari and Red Bull target Monaco upturn|
|Horoya 2 Mamelodi Sundowns 2: Camara header denies visitors´ comeback|
|Du Plessis rescue mission takes Super Kings to IPL final|
|Seedorf to leave relegated Deportivo|
|Wenger turned down Real Madrid ´two or three times´|
|Kane dreams of lifting World Cup trophy as England captain|
|UEFA opens disciplinary proceedings against Liverpool & Roma|
|Yates stays on course for Giro title, Dennis wins time trial|
|Brighton sign Nigeria international Balogun|
|Ronaldo again pips LeBron and Messi as sport´s most famous star|
|Marcelo fears backlash if Madrid lose Champions League final|
|Messi joins Argentina´s World Cup training camp|
|FIFA finds no doping cases in Russia´s World Cup squad|
|Liverpool´s strikeforce reminds Ronaldo of Real Madrid|
|Hysaj staying at Napoli ´regardless of Sarri´s future´|
|Amir fully fit for Lord´s Test|
|A fast start to life - The Golden Knights and the expansion teams who excelled early|
|Molina gets two-year anti-doping ban for positive test after Joshua bout|
|Ramos: We´re a vintage Real Madrid team|
|Klopp key to controlling Liverpool emotions, says Alonso|
|Bjorn names Westwood, Harrington, Donald and McDowell as Europe vice-captains|
|Scarlets players left wounded by ´shocking´ Scotstoun pitch|
|Arsenal fined £20,000 for Leicester penalty protest|
|Storm offer Bellamy ´significant´ deal amid reported Broncos interest|
|Rashford writes moving tribute on anniversary of Manchester Arena attack|
|Heaton backs Kane´s captaincy credentials|
|Salah deserves Ballon d´Or if Liverpool win Champions League – Owen|
|Wasps flanker Willis out for up to a year|
|Real Madrid v Liverpool: Is the Champions League enough to save Zidane?|
|I was left out on reputation - Nainggolan angered by World Cup snub|
|Pellegrini targets Europe with West Ham|
|Lopetegui extends Spain contract|
|Edinburgh-bound Barclay´s Scarlets career over following Achilles surgery|
|Saints swoop for NRL star Naiqama|
|Zidane: Be careful when you criticise Ronaldo|
|It doesn´t get better - Stevens relishing best-of-three shootout for Celtics|
|Favre named new Dortmund boss|
|LeBron and Lue hail evergreen Kyle Korver|
|Kane named England captain for World Cup|
|Wright slams Arsenal over Emery: It´s like a sushi shop!|
|Pellegrini named new West Ham manager|
|Late drama and sustained Ronaldo magic - Real Madrid´s road to the Champions League final|
|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|