The Bulls maintained their winning start to the United Rugby Championship (URC) season following a 29-19 win over Ospreys in Swansea.
The Stormers could not contain a second half surge from Edinburgh as the hosts triumphed 38-7 in their United Championship (URC) clash at the Hive in Scotland.
The Sharks had very little to smile about as they fell to a disappointing 38-19 United Rugby Championship (URC) defeat to Benetton at Stadio Monigo.
The Bulls have made four changes as they rotate their forward pack for their round-four United Rugby Championship clash with Welsh outfit Ospreys in Wales.
After three rounds in the United Rugby Championship, the Sharks have surged into the top eight with one match remaining in their three-week European tour.
Loose forward Marcel Theunissen has made an impressive start to the United Rugby Championship season on tour in Europe and is determined to continue raising his game.