The double champions Leicester have reached the European Cup rugby quarter-finals, despite a 15-9 defeat to the Ospreys.
The Tigers, winners in 2001 and 2002, picked up a crucial losing bonus point to make sure of top spot in Pool Three with 21 points.
Ospreys dominated the tense Liberty Stadium encounter but their stylish, fast-breaking backs were unable to break through the unyielding Leicester defence which stood firm even when they were reduced to 14 men late in the first half.
