The Stormers held out a determined Harlequins outfit for a 32-28 victory in their Heineken Champions Cup top-16 clash at the DHL Stadium in Cape Town on Saturday.
The Sharks made history as the first SA team to reach the quarter-finals of the Champions Cup as their forward power inspired them to a 50-35 win over Munster.
If any South African team earns a "home" semi-final in the Champions Cup, they will have to play the match in Europe.
Sharks winger Werner Kok spent 10 minutes in the sin-bin after receiving a yellow card for a WWE-esque suplex in the opening stages of his team's Champions Cup game against Bordeaux-Begles.
Springbok forwards Frans Malherbe and Marvin Orie have been included in the Stormers team to face London Irish in Saturday's Heineken Champions Cup encounter at DHL Stadium.
The Cheetahs have lost the services of flanker Oupa Mohoje for the next three weeks after he was hit with a suspension for a high tackle.