Alex Allan's dismissal did not prove costly as Glasgow Warriors beat the Scarlets, while Leinster scored 59 in a victory over the Dragons.
Pro14 Conference A leaders Glasgow Warriors overcame Alex Allan's early red card to beat the Scarlets 29-20 on Saturday, while Conference B table-toppers Leinster were convincing 59-10 winners over the Dragons.
Glasgow had to play for over an hour with 14 men after Allan was dismissed for making direct contact with the head of Jake Ball when the score was 3-3.
However, the hosts built up a big second-half lead thanks largely to Brandon Thomson, who scored 24 of their 29 points.
The Scarlets rallied with three tries through Jonathan Davies, Steff Evans and Clayton Blommetjies but Glasgow held on to extend their lead in Conference A to seven points.
Scarlets' loss was also a boost to Leinster, who ran in nine tries in a 59-10 away thrashing of the Dragons.
Dave Kearney and Jimmy O'Brien each crossed twice while Scott Penny, Scott Fardy, Caelan Doris, Hugo Keenan and Bryan Byrne also scored tries.
Epalahame Faiva dotted down three times before half-time as Benetton Treviso secured a 22-19 away win over Conference B's bottom side Southern Kings.
Two second-half penalties from John Cooney ensured Ulster claimed a narrow 16-12 home success over Cardiff Blues while Connacht edged to a 21-17 win at the Cheetahs.