Temba Bavuma led South Africa's resurgence against West Indies after a slow start to finish day three of the second Test with a lead of 356 with three wickets remaining.
A strong opening session for the visitors provided hope with the deficit just 138 at lunch, with South Africa already four wickets down at the Wanderers.
However, captain Bavuma turned the tide with a valiant display with the bat to put his side in cruise control and finished the day unbeaten on 171.
Just four runs shy of 3,000 in his Test career, Bavuma could start day four with two landmarks if he adds another 29 on Saturday.
Kyle Mayers struck twice early as West Indies took momentum, with Kemar Roach then landing the big wicket of Aiden Markram (18) as he forced an edge to Joshua Da Silva.
Bavuma led South Africa's recovery, putting on 37 with Ryan Rickelton (10) for the fourth wicket, but Raymon Reifer removed Rickelton in the last over before lunch to end the session on a high.
The Proteas responded in the second session, despite losing Heinrich Klaasen for 14, with Bavuma and Wiaan Mulder (42) adding a partnership of 103.
Mulder eventually fell to Alzarri Joseph after pulling a short ball to Tagenarine Chanderpaul, before Simon Harmer (19) was trapped lbw by Jason Holder.
South Africa will resume on 287-7 on day four assuming they do not declare overnight, with Bavuma presumably eager to complete his first ever Test double century.
Unstoppable Bavuma
When the South Africa captain walked out to bat, his side were 8-2 and had already lost Markram, but Bavuma repaired the innings and established a commanding lead with his second Test ton.
His tally leaves him sat on 2,996 runs in his Test career, with a landmark on the cards if South Africa do not declare overnight.
Mayers' strong start
Dismissing Dean Elgar (5) and Tony de Zorzi (1) inside the opening eight overs, Mayers looked to have put West Indies on course to clawing their way back into the Test.
He only conceded 25 runs from his 13 overs, but the tourists had no answer to Bavuma's stunning display.
Real Madrid 5-0 Alaves: Vinicius double continues LaLiga champions party
Vinicius Junior scored twice as newly-crowned LaLiga champions Real Madrid thrashed visitors Alaves 5-0 on Tuesday, after the hosts had paraded the trophy in front of the home fans before the game.
Jude Bellingham and Vinicius scored a goal each inside 30 minutes before Federico Valverde put Los Blancos 3-0 up at the break, unleashing an unstoppable shot into the roof of the net in first-half stoppage time.
Vinicius added one more in the 70th minute from a precise cross by Bellingham that the Brazilian fired into the top corner, and substitute Arda Guler completed the scoring with a low finish.
Carlo Ancelotti's side travel to Villarreal on Sunday before hosting Real Betis on May 25 ahead of their Champions League final against Borussia Dortmund on June 1.
Having thrashed Granada 4-0 on Saturday and Cadiz 3-0, either side of their Champions League semi-final victory over Bayern, Real are firing on all fronts heading into the Wembley Stadium showpiece.
Meanwhile, Alavez remain 11th in the table heading into their next game against Getafe at home on Saturday.
Data Debrief: Madrid capitalise on opportunities
Madrid found the back of the net five times from just 2.47 expected goals (xG), suggesting Los Blancos' finishing quality was far greater than Alaves' 1.28 xG.
Ancelotti's side have now kept 20 clean sheets in 36 LaLiga games this campaign, their most in a single season in the competition's history (19 in the 1986-87, 1987-88 and 2019-20 seasons).
Gauff sets up Swiatek semi-final meeting after downing Zheng in Rome
Coco Gauff will have the chance to down world number one Iga Swiatek after progressing to the Italian Open semi-finals with Tuesday's victory over Qinwen Zheng.
The 20-year-old breezed into the last-four draw in Rome after her straight-sets victory over Zheng, winning 7-6 (7-4) 6-1.
Gauff faced just one break point throughout the match, failing to hold her serve at 5-3 up as seven-seed Zhen battled back in the first set.
Yet Gauff eased through the tie-break and never looked back from there on, teeing up a meeting with Swiatek, who overcame Madison Keys in straight sets in her quarter-final clash.
Data Debrief: Young Gauff powers on
No player has won more matches than Gauff (61) in WTA-1000 events before turning 21, since the introduction of the format in 2009, as the American moved past Caroline Wozniacki (60) with victory here.
Wozniacki (eight) is also the only player to manage more WTA-1000 semi-final appearances before her 21th birthday, with Gauff's last-four qualification here taking her onto six – one ahead of Swiatek.
Rangers 5-2 Dundee: Cantwell and Wright keep Celtic's title party on hold
Rangers kept Celtic's Scottish Premiership celebrations on ice after Todd Cantwell and Scott Wright inspired a remarkable turnaround to hammer Dundee 5-2 at Ibrox Stadium on Tuesday.
Philippe Clement's side could not afford to drop points in this clash and seemed set to do so after Jordan McGhee bundled home before Antonio Portales headed past Jack Butland in the first half.
Ross McCausland managed to slice the deficit on the stroke of half-time for the hosts, sliding in to convert from Leon King's cross and teeing up a monumental comeback.
The Ibrox crowd were offered further inspiration to keep the title race alive when Cyriel Dessers glanced in from Cantwell's delivery after 52 minutes.
Former Norwich City midfielder Cantwell's fortuitous cross then dipped over Jon McCracken as Rangers hit the front for the first time, before Wright's pair of late finishes sealed the much-needed three points.
Yet this Rangers salvaging act could still matter for little, with Celtic requiring just a point away to Kilmarnock on Wednesday to seal a third successive top-flight trophy.
Data Debrief: Attacking barrage pays dividends
Clement may apportion this victory to Rangers' unrelenting desire to keep the title race ongoing, blasting 31 shots – and 13 of those on target – at the Dundee target for their 3.34 expected goals (xG) tally.
A plethora of attacking opportunities must be credited to star man Cantwell, who created a game-leading six chances – four more than any other Rangers team-mate.
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