Manchester City won 2-0 at Salzburg in a clash of two big-spending clubs who had been aiming for the Champions League but had to settle for the second-tier competition.
None of Italy's four representatives won a game between them while three of the four Spanish teams were beaten.
GEAR:Play like Europe's best with range of Champions League and Europa League footballs
Juve's Brazil World Cup villain Felipe Melo gave away an early penalty as the Italians fell two goals behind with Artjoms Rudnevs grabbing a hat-trick for the visitors including a stoppage-time equaliser in their Group A match.
Felipe Melo, who enhanced his reputation for reckless tackling by getting sent off in Brazil's World Cup quarter-final defeat by Netherlands, produced a familiarly clumsy challenge in the 13th minute and Rudnevs opened his account from ths spot.
Aris's Spanish forward Javito scored just before the hour against Atletico in Group B, running onto a flicked pass by Carlos Ruiz and firing a powerful shot into the corner, as they preserved an unbeaten home record in European competition.
Spain forward David Silva and Brazilian striker Jo scored in each half to give the world's richest club Manchester City a 2-0 win at wealthy Austrian champions Salzburg in Group A.
