An important 12-6 win over Leinster moved Glasgow Warriors above rivals Edinburgh in the Guinness Pro12 table to strengthen their hopes of a play-off place whilst Leinster's defeat means the Irish province stay 2nd.
Cardiff Blues put a large dent in Munster's hopes of a Guinness Pro12 play-off berth by beating them 37-28 in an enthralling game at Cardiff Arms Park.
Returning Glasgow fly-half Rory Clegg has been thrown straight into Gregor Townsend's side for Friday night's Guinness Pro12 clash with Leinster at Scotstoun.
Ulster bounced back from two consecutive defeats to get their Guinness Pro12 play-off ambitions back on track with a 32-0 bonus-point victory over Zebre at the Kingspan Stadium.
Dan Leavy scored the bonus-point clinching try two minutes from time as Leinster closed the gap on Guinness Pro12 leaders Connacht to a point with a 27-10 win over Zebre.
Two second-half Ian Keatley penalties were to prove decisive as Munster cameback from 10-5 down to overcome a stubborn Treviso side 16-13 at a wintry Stadio Monigo
The Scarlets boosted their PRO12 play-off hopes by sealing a rare league double over Ulster with a 21-20 victory at the Kingspan Stadium on Sunday, and in doing so traded places with their hosts in the table.