Defending champions the Bulls were kept scoreless by the Crusaders as the hosts cruised to a comfortable 27-0 win in their Super Rugby match at Alpine Energy Stadium in Timaru.
The Crusaders dominated territory and possession from the outset, leading 14-0 at half-time after a try from Sonny Bill Williams and three penalties from Matt Berquist.
Israel Dagg crossed after the break and they scored their third try through Tom Marshall after 71 minutes, but the Bulls denied them a bonus-point try and had their best period of the game in the last 10 minutes.
The Stormers turned in an error-strewn performance to suffer their first loss of the season against the in-form Reds at Newlands.
Quade Cooper kicked 14 points in what was a tight affair, with Mike Harris' solitary try late on adding gloss to the 19-6 win.
The Brumbies, meanwhile, ended a five-game losing streak as they edged out the Hurricanes 17-16 at Canberra Stadium.
The NSW Waratahs continued their impressive form with a 31-3 bonus-point thrashing of the Western Force in Perth.
The Waratahs overcame the absence of injured stars Phil Waugh and Berrick Barnes to claim their third straight victory and fifth win of the season, which saw them move one point in front of Queensland at the top of the Australian conference.