Scarlets paid a heavy price for resting internationals Stephen Jones, Sean Lamont and Matthew Rees when they suffered a 34-28 defeat to Benetton Treviso on Saturday as Italian sides made their Celtic League bow.
The Llanelli-based Scarlets had led 22-9 at the break, but the home side stormed back to register a historic win with winger Tommaso Benvenuti scored the winning try four minutes from the end.
Halfback Tobias Botes also scored a try and kicked 19 points.
There was no such luck for Italy's other representatives, Aironi, who lost 33-17 away to Munster.
Rugby: Treviso stun Scarlets
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