The Brazilians were completely outplayed by their North African counterparts and found themselves a goal behind in just the second minute when former Orlando Pirates striker Blaise Lelo-Mbele’s shot was parried by goalkeeper Calvin Marlin, for Mbele’s striker partner Blaise Kouassi to slot home.
Lelo-Mbele made it 2-0 six minutes later when he slipped the ball under a diving Marlin, with Sundowns’ defence nowhere to be seen.
The visitors’ first strike on goal came in the 14th minute when Lerato Chabangu sent his effort high over the bar from the edge of the area.
Kouassi made it 3-0 just before the half hour when he headed home from close range and the score remained that way heading into the break.
Sundowns coach Gordon Igesund made several changes in the second period, but this had little effect on the game, as Sfaxien maintained their dominance.
The hosts made it 4-0 in the referee’s optional time through strike by midfielder Naby Soumah.