The Jaguares trail the Bulls and the Sharks by only a point after clinging on to defeat the Stormers.
Grenoble look to be heading for a relegation play-off after losing at home to their nearest rivals Agen.
Having spent six successive years in the top flight, Newcastle Falcons were relegated from the Premiership on Saturday.
The Bulls were given a big test by the Waratahs, but came through it courtesy of Simphiwe Matanzima's try.
Ben Smith damaged his hamstring and suffered a cut chin in a pulsating Super Rugby encounter at Forsyth Barr Stadium.
The Hurricanes scored 26 points in the opening 22 minutes to beat the Rebels, while the Chiefs came back to draw 31-31 with the...
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