Saracens numb Wasps' sting
England lock Maro Itoje was at the heart of a committed Saracens forward effort as they saw off their fellow English counterparts and kept them on course for a domestic and European double.
The London club will now play the winners of Sunday's second semifinal between Leicester and Paris-based Racing 92 in the May 14 European final in Lyon.
Saracens dominated up front but could not shake Wasps off as they unusually squandered chances.
"The resilience in the team and the quality of the person in the team helps us control games and come through difficult points in the match," said Saracens lock, Maro Itoje.
Saracens, losing European finalists in 2014 and yet to win the continental title, led 8-7 at half-time after a charge-down try by Michael Rhodes and a penalty by Owen Farrell helped them recover after it took Wasps just 73 seconds to open the scoring through Dan Robson's converted try.
Two more penalties by England goal-kicker Farrell and one from Gopperth followed.
Farrell kicked another penalty before a Saracens penalty try late on took them into a 24-10 lead.
There was still time for Wasps replacement Ashley Johnson to score a converted try, but Saracens saw out the game.
"When you run yourself into the ground like we did, then there is not much more that you can ask," said Wasps captain, James Haskell.
"We have to pick ourselves up and go again because there is still the (English) Premiership to play for."
The two sides had met twice in the Premiership this season, with Saracens winning 26-16 in December and Wasps enjoying a 64-23 rout in February – when several of Saracens' England grand slam-winning stars were on Six Nations duty against Italy.
Wasps, the last English side to be crowned champions of Europe in 2007, lived up to their reputation for exciting rugby by catching Saracens cold with a scintillating try just over a minute into the match.
Gopperth and veteran Australia flank George Smith worked a switch move that released express wing Christian Wade, who scored six tries in a Premiership match against Worcester last weekend.
Wade collected the ball on the halfway line and beat two men before his inside pass found scrumhalf Robson, who in turn side-stepped his marker and went over.
Kiwi flyhalf Gopperth, whose conversion with the last kick of the game sealed a dramatic quarterfinal win over Exeter, added the extras and Wasps led 7-0.
Farrell then surprisingly pulled a 30-metre penalty wide of the posts.
Saracens, however were gaining ground through their forwards and their pressure was eventually rewarded when flank Rhodes charged down Gopperth's clearance kick for a 28th-minute try.
Farrell missed the conversion from out on the right and Wasps still led 7-5.
But a Wasps ruck offence on the stroke of halftime saw Farrell succeed with an easy penalty that gave Sarries an 8-7 lead at the break.
And when Smith infringed at a ruck early in the second period, Farrell punished Wasps with a successful penalty from just inside the halfway line.
Minutes later Farrell landed near 50-metre penalty and Saracens were 14-7 in front.
Saracens though were down to 14 men when Farrell was shown a yellow card in the 51st minute for a head-high tackle on Robson that eventually saw the Wasps No 9 taken off the field on a stretcher.
Gopperth kicked the resulting penalty and Saracens' lead had been cut to 14-10.
Haskell was involved in some shuddering collisions with England teammates Billy Vunipola and Itoje up front.
Farrell, head bandaged after his clash with Robson, then missed a long-range penalty immediately upon his return from the sin-bin.
But he made no mistake from in front of the posts with 12 minutes left when Wasps replacement Simon McIntyre was sin-binned for kicking Itoje in the face.
Saracens, starving Wasps of posssion, extended their with a 73rd-minute penalty try awarded after Wasps collapsed a maul that started from outside the 22.
Johnson then pounced after a good break by Elliot Daly but it was all too late for Wasps.
Man of the Match: A menace at the lineout, Maro Itoje stole two balls at the set-piece and his persistant work was crucial to their forward dominance. The second row had strong competition in Mako Vunipola, who was a monster on defence and boasted 19 tackles and 13 carries, and No.8 Billy Vunipola, who also made massive hits and made his presence known at the breakdowns.
The scorers:
For Saracens:
Tries: Rhodes, penalty
Con: Farrell
Pens: Farrell 4
For Wasps:
Tries: Robson, Johnson
Cons: Gopperth 2
Pen: Gopperth
Teams:
Saracens: 15 Alex Goode, 14 Chris Ashton, 13 Duncan Taylor, 12 Brad Barrit (captain), 11 Chris Wyles, 10 Owen Farrell, 9 Richard Wigglesworth, 8 Billy Vunipola, 7 Will Faser, 6 Michael Rhodes, 5 George Kruis, 4 Maro Itoje, 3 Petrus du Plessis, 2 Schalk Brits, 1 Maku Vunipola.
Replacements: 16 Jared Saunders, 17 Richard Barrington, 18 Titi Lamasitele, 19 Jim Hamilton, 20 Jackson Wray, 21 Niel de Kock, 22 Charlie Hodgson, 23 Marcelo Bosch.
Wasps: 15 Charles Piutau, 14 Christian Wade, 13 Elliot Daly, 12 Siale Piutau, 11 Frank Halai, 10 Jimmy Gopperth, 9 Dan Robson, 8 Nathan Hughes, 7 George Smith, 6 James Haskell (captain), 5 Bradley Davies, 4 Joe Launchbury, 3 Lorenzo Cittadini, 2 Carlo Festuccia, 1 Matt Mullan.
Replacements: 16 Ashley Johnson, 17 Simon McIntyre, 18 Phil Swainston, 19 Sam Jones, 20 Thomas Young, 21 Joe Simpson, 22 Ruaridh Jackson, 23 Rob Miller.
