Glasgow Warriors secured a first win of the Pro14 season at the third attempt, while Scarlets continued their perfect start to the campaign on Saturday.
Last season's finalists Glasgow held off the challenge of Cardiff Blues 17-13 at Scotstoun, with early tries from Callum Gibbins and Nick Frisby proving decisive, as they put defeats to Cheetahs and Scarlets behind them.
Aled Summerhill's score on the break brought Cardiff back into it, but the Blues did not show enough in the second half to fight their way back into the game.
Scarlets crushed Zebre 54-10 in a bonus-point triumph in Llanelli that leaves them top of Conference B in the embryonic Pro14 standings.
Kieran Hardy and Johnny McNicholl each dotted down twice and Josh Macleod, Ryan Conbeer, Taylor Davies and Josh Helps all registered in the rout.
Ulster were a class above Southern Kings in Port Elizabeth, John Cooney scoring two tries in an emphatic 42-17 victory for the Irish province.
Rounding out the action, hooker Sam Parry celebrated a hat-trick of tries as Ospreys overcame Benetton Treviso 24-20.