Wasps claimed their first Guinness Premiership win of the season with a vital 28-14 success over London Irish at Adams Park on Sunday.
The European champions' victory sees them climb away from the foot of the table and also move above the Exiles into ninth position.
Two first-half tries for Wasps, scored by lock George Skivington and fly-half Danny Cipriani, helped the hosts into a promising 15-3 lead approaching the interval.
But their healthy cushion was trimmed to 15-9 at the turnaround following a brace of Eoghan Hickey penalties.
However, a second-half effort from England wing Tom Voyce secured a welcome victory for Wasps - although a try-scoring bonus-point proved elusive as the Exiles' defence stood firm.
Voyce's try two minutes after the restart was crucial in enabling the home side to maintain control of proceedings.
The score was converted by Mark van Gisbergen, who added the remainder of Wasps' points with three penalties and two conversions.
Full-back Delon Armitage crossed for the visitors but Wasps had the last word through Van Gisbergen's third shot at goal.
Exiles' wing Topsy Ojo was sin-binned in the 57th minute, with team-mate and captain Bob Casey following him four minutes from time.
And Wasps' Eoin Reddan was also shown a yellow-card two minutes from the end, as Ian McGeechan's side finally got their season up and running.
Tries: Skivington, Cipriani, Voyce
Con: Van Gisbergen 2
Pen: Van Gisbergen 3
For London Irish:
Tries: D Armitage
Pen: Hickey 3
Wasps: 15 Mark Van Gisbergen, 14 David Doherty, 13 Fraser Waters, 12 Riki Flutey, 11 Tom Voyce, 10 Danny Cipriani, 9 Eoin Reddan (c), 8 James Haskell, 7 Rob Webber, 6 Dan Leo, 5 George Skivington, 4 Richard Birkett, 3 Pat Barnard, 2 Joe Ward, 1 Michael Holford.
Replacements: 16 Charlie Beech, 17 Nick Adams, 18 Hugo Ellis, 19 John Hart, 20 Simon Amor, 21 Dave Walder, 22 Rob Hoadley.
London Irish: 15 Delon Armitage, 14 Topsy Ojo, 13 Dominic Shabbo, 12 Seilala Mapusua, 11 Sailosi Tagicakibau, 10 Eoghan Hickey, 9 Paul Hodgson, 8 Richard Thorpe, 7 Steffon Armitage, 6 Declan Danaher, 5 Bob Casey (c), 4 Nick Kennedy, 3 Tonga Lea'aetoa, 2 David Paice, 1 Dan Murphy.
Replacements: 16 Casey Dunning, 17 Stuart Mackie, 18 Tom Warren, 19 Kieran Roche, 20 Phil Murphy, 21 Warren Fury, 22 Jeremy Staunton.
Referee: Roy Maybank
Touch judges: Ken Stewart, Paul Dickens
Television match official: John Burtenshaw