Mark van Gisbergen led the way with a 23-point haul as Wasps overpowered Leeds up front to register their first Premiership win of the season.

The champions, who paraded the Zurich Premiership trophy before the start of their first home game of the campaign, were stunned before the break when Dan Scarbrough struck against the run of play for the Tykes.

But they moved into top gear after the interval when Rob Howley scored an interception try - and fly-half van Gisbergen followed up with one of his own to go with his three conversions and four penalties.

Leeds had handed a debut to Liam Botham - who linked up with Scarbrough in midfield - and the former Newcastle player carved out one try and was a constant threat with the ball in hand.

But his team were missing skipper Mike Shelley, Clive Stuart-Smith and Tom Palmer and outgunned around the pitch by outstanding forwards like Simon Shaw, Craig Dowd and Trevor Leota.

Eight days earlier, Wasps had surrendered a commanding lead at Harlequins and coach Warren Gatland responded by rejigging the back row by benching Paul Volley, leaving out teenager James Haskell altogether and bringing in James O'Connor and Mark Lock.

The changes had the desired effect for the first half hour, as Leeds were penned in their own half and reduced to scavenging for possession.

The only time they unsettled Wasps was in a simmering off-the-ball battle between Phil Greening and Stuart Hooper which required the intervention of referee Steve Lander for order to be restored.

Van Gisbergen took advantage of the territorial supremacy with penalties in the 18th, 23rd and 28th minutes, but Wasps should have done more with the stream of possession which saw O'Connor go close and Simon Shaw held up on the line.

And when Leeds finally managed to string some phases together, they took advantage with Botham carving out the game's opening try after 32 minutes.

Botham cut back against the grain onto Duncan Hodge's pass and burst through a huge hole on the Wasps 22 before drawing the last two men and putting Scarbrough over on the left.

The trick was nearly repeated in first-half injury-time when Scarbrough was dragged down short of the line and Wasps were lucky to stay in front at the break after Hodge hit the post with his long-range penalty shot.

Gatland introduced Leota at the start of the second half and the Samoan hooker's direct style helped his side increase the tempo as they found top gear with two early scores.

The first was a masterful piece of poaching from veteran scrum-half Rob Howley, who showed what Wales will miss in the World Cup when he anticipated Hodge's pass and raced 60 metres to score.

The second was created by a superb angle of running from Fraser Waters, who cut in from the left to break through the cover with van Gisbergen following up and skipping inside new Tykes full-back Matt Cardey to the line.

Van Gisbergen converted both scores to leave Leeds firmly on the back foot and would have conceded another try on the hour if Waters had not knocked on after a surge down the flank from Shane Roiser.

Former Worcester fly-half Tim Walsh got Leeds into double figures when he stroked over a penalty moments after replacing Hodge in the 61st minute - and his side rallied briefly as Botham, Scarbrough and Phil Christophers counter-attacked from deep.

But Wasps were in no mood to repeat their slip-up at the Stoop a week earlier and they kept up the pressure which led to an injury-time try from replacement Peter Richards.

The former Bristol scrum-half raced into the corner from a quickly-taken penalty and van Gisbergen converted to complete a faultless afternoon with the boot.