A terrific individual effort from David McSharry closed the deficit to eight points by half-time, taking advantage of Fabio Semenzato's sin-binning.

Niall O'Connor landed two second half penalties while Manoa Vosawai was yellow carded, but knock ons and turnovers blighted Connacht's attempts to stave off their eighth successive defeat.

The westerners faced into driving sheets of rain in the first half but made a positive start. John Muldoon was prominent in a couple of early drives before O'Connor knocked a tricky penalty attempt short of the target.

Big Fijian Vosawai had to put in a vital tackle on the advancing McSharry, but Treviso took a 12th minute lead against the run of play.

Willem de Waal punished the hosts for a lineout infringement, moving his side 3-0 ahead, and then some electric interplay between the fast-breaking Ludovico Nitoglia and Williams netted the game's first try.

Nitoglia scampered away from Tiernan O'Halloran, sparking a superb attack which split the Connacht defence and he passed for Williams to dot down by the posts.

The conversion was added by de Waal and the Italians took advantage of a hesitant Connacht back-line to pick off their second try. The ball was hacked on twice before young winger Iannone won the foot race to touch down in the corner.

The Connacht forwards heaped pressure on the visitors from the restart, scrum half Semenzato earning a yellow card for killing the ball close to his try-line.

McSharry weaved in and out to create the opening for his first try in Connacht colours, showing admirable strength to make it over as Treviso scrambled back.

Connacht began to use their maul to good effect either side of half-time, but O'Connor missed a kickable penalty wide after Paul Derbyshire was pinged at a ruck.

Treviso kept things tight, winning a scrum against the head and picking and driving downfield. Yet Vosawai's carding for not rolling away allowed O'Connor squeeze the gap back to five points.

Rodney Ah You came off the home bench to solidify their scrum and David Gannon and Ray Ofisa increased their influence in the loose, with O'Connor firing over his second successful penalty.

With a quarter of an hour remaining, Connacht had enough momentum to get a winning score but they ruined a number of promising situations.

Muldoon's surging run was the best of them but the ball was duly fumbled and Treviso, with their forwards maintaining a high work-rate, tenaciously held on to take the points.