London Wasps opened their Amlin Challenge Cup campaign with a bonus point 38-25 victory over Newport Gwent Dragons at Adams Park.
Dragons opened the scoring with a try by Adam Hughes before Evans and Joe Dixon added further tries for the visitors.
However London Wasps scored four tries through Jack Wallace, Fabio Staibano, Billy Vunipola and Joe Simpson.
Fly half Nicky Robinson put in a strong performance and converted three of his side's tries and kicked four penalties.
Robinson's opposite number Lewis Robling converted two tries and two penalties.
Final Score London Wasps (25) 38 Newport Gwent Dragons (15) 25
Tries: Wallace, Staibano, Vunipola, Simpson
Cons: Robinson 3
Pens: Robinson 4
Newport Gwent Dragons
Tries: Hughes, I Evans, Dixon
Cons: Robling 2
Pens: Robling 2
Referee: Mathieu Raynal (France).
Wasps : Hugo Southwell (capt); Jack Wallace, Chris Bell, Lee Thomas, Tom Varndell; Nick Robinson, Joe Simpson; Zak Taulafo, Tom Lindsay, Fabio Staibano, Joe Launchbury, Marco Wentzel, Ashley Johnson, Jonathan Poff, Billy Vunipola.
Replacements: T Rhys Thomas, Phil Swainston, Lewis Thiede, James Cannon, Sam Jones, Charlie Davies, Tommy Bell, Elliot Daly.
Dragons : Daniel Evans; Will Harries, Adam Hughes, Ashley Smith, Hallam Amos; Lewis Robling, Liam Davies; Aaron Coundley, Sam Parry, Nathan Buck, Jevon Groves, Robert Sidoli, Tom Brown, Lewis Evans (capt), Toby Faletau.
Replacements: Hugh Gustafson, Phil Price, Dan Way, Ian Nimmo, Ieuan Jones, Jonathan Evans, Jack Dixon, Tom Prydie.