Scarlets made it three from three in Pro14 on Sunday as Glasgow Warriors earned a first win of the season.
Ulster suffered a hammering in Bloemfontein, where wing Anthony Volmink scored three of nine tries for the Cheetahs.
Dave Kearney's hat-trick helped Leinster begin the defence of their Pro14 title with a win over Benetton Treviso.
Wales have announced their 42-man training squad in preparation for the 2019 Rugby World Cup.
A dramatic final day of the regular season in the Pro14 saw Glasgow Warriors make the semi-finals, while Ospreys and Scarlets will face off.
The Ospreys have announced that Wales fly-half Gareth Anscombe will join from Pro14 rivals Cardiff Blues ahead of the 2019-20 season.
Glasgow Warriors celebrated the news that head coach Dave Rennie will stay at the club by securing a famous win over Leinster in Dublin.
The top two teams in Conference A in the Pro14 were in fine form on Friday as they enjoyed comprehensive victories.
Josh Navidi will be out for up to three months after going under the knife but the flanker's World Cup participation is not in doubt.
Cardiff Blues coach John Mulvihill is confident Grand Slam winner Gareth Anscombe will sign a new contract with the region.