Sharks' Ntuthuko Mchunu scored two tries in the second half, leading his team to a 29-21 victory over the Lions and securing a home semifinal in the Currie Cup.
Natal Sharks coach Joey Mongalo claims support from the Durban community has made all the difference in their Currie Cup campaign.
Griquas recovered from a halftime deficit to beat Western Province 38-29 in their Currie Cup clash played in Kimberley on Friday.
Following a social media post appearing as a dig at the Bulls, director of rugby Jake White says winger S'bu Nkosi is the only one accountable for the course of his future.
Johan Goosen's 14 points and David Kriel's two tries led the Blue Bulls to a hard-fought 24-17 win over the Pumas at Mbombela Stadium.
The Sharks overcame the Griffons, while the Lions saw off Western Province in Friday evening's Currie Cup action.