Saracens are level with Exeter at the top of the Premiership after fighting back to beat Harlequins.
Leinster are five points clear at the top of Conference B after the defending champions beat Munster at the Aviva Stadium.
South Africa looked set to pull off a famous double over New Zealand, but the world champions rallied to snatch a stunning win.
Connacht finally secured an away derby win at Ulster, taking advantage of Matthew Rea's dismissal early in the second half.
Exeter Chiefs made it six wins out of six in the Premiership after scoring three tries in quick succession in the second half.
Stade Francais could not continue their strong start to the season on Sunday as rivals Racing 92 triumphed in Paris.
Sale Sharks had to settle for a losing bonus point despite scoring three tries against Leicester Tigers at Welford Road.
Michael Cheika's Australia remain bottom of the Rugby Championship standings after a fourth defeat in five as South Africa triumphed.
Rieko Ioane's double helped secure another Rugby Championship trophy for world champions New Zealand on Saturday.
Leinster's Pro14 title defence continued with a fourth win in five, with Glasgow Warriors and the Ospreys matching that return on Saturday.
Top 14 leaders Clermont Auvergne put some daylight between themselves and second-place Stade Francais on Saturday.
Saracens and Exeter Chiefs met in last term's Premiership final and they are making the early running once more this season.
Olly Robinson's late try completed a second-half comeback from Cardiff Blues as they secured a Pro14 victory over the Cheetahs.
Wasps fought back from a 22-13 deficit in the second half at Kingston Park to secure a third successive win in the Premiership.
Montpellier put Toulouse to the sword, Piula Faasalele's dismissal proving to be costly as last year's runners-up scored 10 tries.
Leicester Tigers produced a storming second-half fightback but Ted Hill's late try gave Worcester Warriors a first win of the season.