The Scarlets secured a bonus-point win by running in six tries in their 41-33 victory over Treviso away in Italy on Saturday.
A penalty try and score from wing Frazier Climo gave the Welsh region a 13-9 lead at the interval, while Benetton responded via three Mat Berquist penalties. Berquist added his fourth three-pointer in the second period, but Climo and Gareth Davies touchdowns took the away side clear after the break.
Treviso mounted a revival after that as Robert Barbieri, Meyer Swanepoel and Ludovico Nitoglia went over, but Kristian Phillips and Jordan Williams scores sealed the win.
Although the visitors went into the game in seventh position, they started 17 points behind fourth place Leinster and with very little chance of reaching the play-offs.
However, they opened this game on the front foot and a penalty from Aled Thomas kicked them into a 3-0 lead. The stand-off missed another opportunity from the tee to extend their advantage before Berquist levelled matters after 19 minutes.
Parity didn't last long, though, as the Welsh region scored the first try of the afternoon when a dominant driving maul ended in a Penalty Try.
Benetton hit back and reduced the arrears through the boot of Berquist, but Simon Easterby's men looked dangerous with ball in hand and a well worked move was finished by Climo.
Despite conceding two tries, the hosts continued to battle and another three-pointer by their stand-off gave them hope at the break.
That was almost immediately extinguished at the start of the second half as Climo went over to take them 20-9 ahead. Berquist kicked his fourth penalty of the afternoon to give them brief respite before the Scarlets secured the bonus-point after good work from Phillips sent Davies across the whitewash.
To their credit, the Italian outfit didn't give up as Barbieri drove over, but Phillips' try four minutes later looked to have put the match out of the home side's reach. That was until Swanepoel and Nitoglia touched down late on for Treviso, but Williams' late score denied Benetton the losing bonus-point.
Tries: Barbieri, Swanepoel, Nitoglia
Cons: Berquist 3
Pens: Berquist 4
Tries: Penalty Try, Climo 2, G Davies, K Phillips, Williams
Cons: Thomas 4
Treviso: 15 Mat Berquist, 14 Ludovico Nitoglia, 13 Andrea Pratichetti, 12 Alberto Sgarbi, 11 Brendan Williams, 10 Alberto Di Bernardo, 9 Fabio Semenzato, 8 Marco Filippucci, 7 Paul Derbyshire, 6 Christian Loamanu, 5 Corniel Van Zyl, 4 Valerio BernabÃ² (c), 3 Ignacio Fernandez-Rouyet, 2 Franco Sbaraglini, 1 Matteo Muccignat.
Replacements: 16 Enrico Ceccato, 17 Giovanni Maistri, 18 Pedro Di Santo, 19 Meyer Swanepoel, 20 Robert Barbieri, 21 Jacopo Sarto, 22 James Ambrosini, 23 Enrico Bacchin.
Scarlets: 15 Jordan Williams, 14 Kristian Phillips, 13 Gareth Maule, 12 Adam Warren, 11 Frazier Climo, 10 Aled Thomas, 9 Gareth Davies, 8 Rob McCusker (c), 7 John Barclay, 6 Josh Turnbull, 5 Richard Kelly, 4 George Earle, 3 Jacobie Adriaanse, 2 Kirby Myhill, 1 Phil John
Replacements: 16 Emyr Phillips, 17 Rob Evans, 18 Samson Lee, 19 Johan Snyman, 20 Lewis Rawlins, 21 Aled Davies, 22 Josh Lewis, 23 Gareth Owen
Referee: Lloyd Linton (Wales)
Assistant referees: Claudio Blessano (Italy), Stefano Traversi (Italy)
Television match official: Alan Falzone (Italy)
Citing Commissioner: Stefano Marrama (Italy)