England Sevens star Ugo Monye scored two tries, one in each half, as NEC Harlequins secured their Zurich Wild Card play-off place with a 25-21 victory over Premiership runners-up London Wasps, to complete a notable double over their former neighbours in the capital for the first time in four seasons.
Monye scored his first try in stoppage time at the end of the first half, with the visitors down to 14 men and trailing 10-3, with scoring chances at a premium.
Paul Burke had kicked Quins into an early lead, but such was the pressure that Wasps exerted, the visitors then had to spend the majority of the half inside their own twenty-two but conceded only one try; a short range effort from former All Black prop Craig Dowd that Alex King converted.
King then added a penalty after Chris Bell was sent to the sin-bin for deliberate offside, which left the visitors a converted score behind before Monye performed his first moment of magic.
Receiving a beautifully weighted chipped kick from Burke, Monye was faced with two defenders in front of him and not much room to work with. However, it made little difference to the Sevens star as he twisted one way and then the next, before taking Mark van Gisbergen on the outside and sailing away down the wing for a superb try.
Scotland winger Kenny Logan added a second try early in the second half to restore the seven point gap for the home side and when King added a penalty after 54 minutes the result seemed to be done and dusted, with the scoreboard showing 18-8 to Wasps.
However, the young Quins side refused to be overawed and soon hit back.
The visitors had shown some fighting spirit to repel a couple of Wasps attacks, before Mel Deane sent Tani Fuga on the charge through the middle and although the Quins replacement hooker was halted by van Gisbergen, he was able to off-load to Matt Powell who finished off in style under the posts despite the attentions of Logan.
Burke added the conversion and minutes later supplied another delightful cross-field kick that gave Monye a straight forward catch and a walk over the line to put Quins back in front.
Burke added the extras to give Quins a healthy four point lead (22-18), but King narrowed the gap to a point with a penalty with just over ten minutes to go, which set-up a nail biting finish.
Instead of it being the home team looking the more threatening, it was the visitors who added another score with Burke landing his seventh drop goal of the season five minutes later.
Although Wasps threw everything at Quins in an attempt to preserve their run of 11 successive victories, it was the visitors who showed enough steel to take the sting out of the home attacks and record only their second away win of the season and a date with Leicester Tigers in the Wild Card play-off semi-finals.
During week commencing 22nd April Harlequins will launch an innovative, new Membership Scheme which will replace the existing Season Ticket Holder Programme. Further details of the scheme will be announced in due course.