The Stormers allowed a first-half lead to slip as they fell to a 37-24 defeat against the Ospreys in an exciting clash in Bridgend on Saturday night.
The Bulls opened their United Rugby Championship (URC) campaign with a hard-fought 22-16 victory against Edinburgh at Loftus on Saturday.
The Lions got their URC campaign to a perfect start as they claimed a 35-22 bonus-point victory over Ulster at Ellis Park.
Centre Dan du Plessis will captain the Stormers in their United Rugby Championship opener against Ospreys at Dunraven Brewery Field in Bridgend on Saturday.
Bulls boss Jake White has included Springboks Canan Moodie and Johan Grobbelaar in his matchday 23 to face Edinburgh in their United Rugby Championship opener.
Springbok coach Rassie Erasmus has released three players, Ben-Jason Dixon, Johan Grobbelaar, and Canan Moodie, to their local franchises.