Nick Evans produced a match-winning performance at The Stoop as Harlequins beat London rivals Wasps 32-22 to reach the semi-finals of the Amlin Challenge Cup.
The New Zealand fly-half kicked five penalties, two conversions and a sweet drop-goal in a faultless kicking display as Harlequins succeeded at keeping a spirited Wasps side at arm's length.
Harlequins had roared into a 14-0 lead with tries from Danny Care and Maurie Fa'asavalu before some of the crowd had even taken their seats.
Wasps responded well with tries from Seb Jewell, Tom Lindsay and Richard Haughton but Evans' golden boot guided Harlequins to victory.
Harlequins, who won this tournament in 2001 and 2004, will face either Munster or Brive in the semi-finals.
For Wasps, defeat effectively signals the end of their season. Winning the Amlin Challenge Cup was their only realistic route back into Heineken Cup rugby next season.