Apart from an interlude in the second half when Treviso scored a terrific try through Ludovico Nitoglia, the Ospreys played with the swagger of a team who had ended Leinster's 20-game unbeaten run in their last match adding further tries through Joe Bearman and Tom Isaacs.
Biggar knocked over a penalty after 10 minutes and followed it up with a delightful piece of back play to create a try for inside-centre Beck.
Biggar hoisted an enormous Garryowen on to Treviso winger Tommaso Benvenuti but the ball never arrived as Biggar sprinted forward and out-jumped the Italian, collecting the ball in the process. On coming back to earth he passed onto to wing Hanno Dirksen who fed Beck inside him for a great score.
Biggar converted and then chipped in with a penalty to put the Ospreys firmly in control at 13-3.
With the half-hour mark approaching prop Adam Jones, making his first home appearance for his region since helping Wales to the Grand Slam, popped up at scrum-half and charged for the line. He off-loaded to front-row partner James who barrelled over. Biggar's conversion made the score 20-3 and it stayed that until half-time.
Immediately after the break Beck had his second when a Shane Williams pass gave him the space to dummy and cut inside Kris Burton, Biggar again converting.
In the 55th minute Treviso showed attacking brilliance to get a converted try back. Scrum-half Edoardo Gori launched an attack from inside his 22 and when the Ospreys did bring the Italians' attack to a halt, Gori brought the ball right and wing Nitoglia stepped inside the cover defence to score. Alberto Di Bernardo added the afters.
When Tommaso Benvenuti got sin binned for a deliberate knock-on ten minutes from time, the Ospreys turned the screw.
First No. 8 Bearman went over from a five-metre scrum for the bonus-point try and then replacement wing Isaacs danced down the touchline after a trademark break from Williams, making a surprise appearance for the Ospreys. Biggar converted to end the match with a personal haul of 16 points.
|Ospreys Score Card|
|Benetton Treviso Score Card|
|Alberto di Bernardo||1||2|