Robbie Henshaw made his breakthrough at full-back and in his first game for Connacht since returning from the Rugby World Cup he was back in the No.15 shirt, dotting down for one of his side's three tries as Matt Healy and Tom McCartney notched the others.
Jayden Hayward crossed twice for Treviso and Edoardo Gori grabbed another try at the death but the Italians still slipped to a 14th consecutive GUINNESS PRO12 defeat.
Munster are up to second in the table after an early try from John Ryan helped them to a dramatic and hard-fought 16-14 victory over Edinburgh at BT Murrayfield.
Will Helu's scored his first try for the hosts and Sam Hidalgo-Clyne saw his attempted drop goal charged down in the third minute of injury time as Munster held on.
At the RDS Arena Ian Madigan kicked 14 points as Leinster handed Scarlets a first loss of the season, triumphing 19-15.
Scarlets' centre duo Gareth Owen and Hadleigh Parkes bagged a try apiece but Mike Ross crossed the whitewash for his first PRO12 score as the hosts remain fourth.
Ulster finally ended their away hoodoo as Paul Marshall grabbed the only try of game in a 19-12 win over Newport Gwent Dragons at Rodney Parade - their first league win on the road since April.
Elsewhere, Glasgow Warriors also secured an away victory by downing Cardiff Blues 35-30 in a thriller at BT Sport Cardiff Arms Park - Finn Russell booting 15 points while Ryan Grant, Leone Nakarawa, Jonny Gray and Taqele Naiyaravoro all dotted down.
And Eli Walker's try double helped Ospreys collect just their second GUINNESS PRO12 win of the season as they touched down six times in total during a 36-3 romp over Zebre.
TRY OF THE WEEKEND
Edinburgh ended up losing by two points to Munster at BT Murrayfield but Will Helu rounded off a magnificent team move for the try of the weekend.
Damien Hoyland made the initial break off the right wing and after spreading the ball left, Tom Brown cut in before slipping a reverse pass to Helu who held off a defender and stretched out for his first Edinburgh try.
BREAK OF THE WEEKEND
No-one has ever accused Matt Healy of being slow on the field and the Connacht winger once again demonstrated his raw pace in a scintillating break during their 33-19 win over Treviso.
Healy collected the ball on halfway blitzed past poor Andrea Pratichetti down the outside before producing a nice shimmy and cutting inside to dot down for the Irish side's third try as they moved to the top of the table.
PLAY OF THE WEEKEND
Josh Matavesi had a sterling game for Ospreys against Zebre, scoring one try and creating another in the 36-3 victory.
And it was the latter which earns him play of the weekend as he scythed through the Zebre defensive line before delivering a pinpoint, no-look pass to Justin Tipuric for the score
PLAYER OF THE WEEKEND
Leone Nakarawa shone for Fiji at the recent Rugby World Cup and if his performance in Glasgow Warriors' 35-30 win over Cardiff Blues is anything to go by, he has brought that form into the GUINNESS PRO12.
The lock was imperious at the line-out, a warrior at the breakdown and a constant danger in the loose as he also grabbed the Warriors' first try of the match - launching himself from the back of a ruck to touch down with one hand.
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