CARDIFF: Leinster completed an extraordinary comeback when it stormed back from a 16-point halftime deficit against Northampton to win 33-22 and lift the Heineken Cup for the second time in three years Saturday. Northampton looked on course for its second title through first-half tries to Phil Dowson, Ben Foden and Dylan Hartley before Leinster roared back with flyhalf Jonathan Sexton scoring two tries and kicking 18 points. Nathan Hines weighed in with its third try to complete an astonishing turnaround and make it four Heineken Cup wins for Ireland in the last six finals The prospect looked highly unlikely after a first half in which Northampton, beaten by Leicester in last week's Premiership semifinals, was in total control. Leinster was a transformed team after the break and hit back. Harlequins bag cup In Cardiff, Argentine winger Gonzalo Camacho scored a try three minutes from time to give Harlequins a dramatic 19-18 win over Stade Francais Friday in the European Challenge Cup final. It was Harlequins' third triumph in the tournament to add to their 2001 and 2004 wins. But the English side left it late to secure victory. Victory also guaranteed Harlequins a place in the European Cup next season while big-spending Stade's poor season, which saw them fail to qualify for the continent's top competition, ended on a depressing note.