The win keeps Masandawana in the title race, although the Buccaneers maintain the edge on goal difference with 12 matches remaining.
Sundowns made two changes from their midweek win over AmaZulu, recalling Marcelo Allende and Arthur Sales, while Monnapule Saleng began on the bench. From the outset, the hosts pressed for an early breakthrough. Jayden Adams narrowly missed a header from a Teboho Mokoena cross in the sixth minute, before Sales unleashed a half-volley that Toaster Nsabata comfortably saved.
The deadlock was finally broken in the 31st minute. Allende linked with Sales for a slick one-two on the edge of the area and curled a spectacular strike into the top corner, giving Sundowns a deserved 1-0 lead. The home side continued to dominate, but Sekhukhune offered sporadic threats, with Shaun Mogaila's tame effort failing to test Ronwen Williams.
Sekhukhune drew level early in the second half when Bradley Grobler converted a Vuyo Letlapa cross with a precise header in the 51st minute. The veteran striker had squandered an earlier chance, but this time he made no mistake, sending the visitors back into contention.
Sundowns turned to their bench to reclaim the lead, introducing Monnapule Saleng and Lebo Mothiba. Saleng's impact was immediate as he delivered a teasing cross for Iqraam Rayners, who bundled the ball in for a 2-1 advantage. Rayners completed his brace deep into stoppage time, finishing a surging run past Nsabata to seal the 3-1 win.
Along the way, Sundowns' goalkeeper Ronwen Williams and Sekhukhune's Nsabata were both called into action, keeping their sides in contention at key moments. Allende's brilliance, Rayners' clinical finishing, and the timely substitutions ultimately made the difference for the defending champions.
With this result, Sundowns now sit on 41 points, matching Orlando Pirates, who leapfrogged Kaizer Chiefs with a 3-0 derby win on Saturday. The title race is set to remain tight, with Masandawana looking to build momentum as they chase their third consecutive league crown.