Stormers boss Allister Coetzee described his side's performance as "embarrassing" following their 21-30 loss to the Rebels.
The Sharks ended a five-game losing run on Friday after recording a hard-fought 23-13 victory over the Western Force at nib Stadium.
The Stormers were denied crucial points in Melbourne on Friday as a controversial penalty try handed the Rebels a 30-21 victory at AAMI Park.
The Chiefs opened up a seven-point lead atop the New Zealand conference on Friday after beating the Hurricanes 17-12 at Westpac Stadium.
The Brumbies will be looking to maintain their standing at the top of the pile when they face the 'Tahs but it will be no easy task in Sydney.
The Bulls welcome the Highlanders to fortress Loftus Versfeld on Saturday where they will surely be eyeing a five-point haul.
Two of the tournament's most entertaining sides, the Cheetahs and the Reds, will face each other in Bloemfontein on Saturday.
What They Said
To be honest, it was embarrassing... the players understood the importance of this game ...but, yet again, we were our own worst enemies.
~ Stormers coach Allister Coetzee ~
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