Liverpool v Villarreal facts: No.1
On four previous occasions Liverpool have lost a European semi-final 1-0 and progressed to the final twice.
In 1966, they beat Celtic 2-0 at Anfield in the Cup Winners' Cup and defeated Chelsea on penalties at home in the 2007 Champions League after a single-goal defeat at Stamford Bridge.
In the 1971 Fairs Cup Liverpool played out a goalless draw at Leeds United after losing 1-0 at Anfield, while six years ago they were beaten on away goals in front of the Kop by Atletico Madrid in this competition.