The red tide kept probing but Januzaj rushed a curler after being picked out by Larnell Cole's intelligent through ball and Powell skied a chance after initially winning possession with a superb challenge and running onto Lingard's cute backheel.
Tyler Blackett blazed off target and, after a spellbinding move featuring some exquisite one-touch passing, Januzaj was unable to end it for a flourish for what would have been an early Goal of the Season contender. Roofe kept Amos on his toes with another set-piece that drifted wide but substitute Lawrence wrapped things up with a strike made in South America as Guillermo Varela played a one-two with Henriquez to tee up a straightforward finish by the Welshman. It could have been worse for the Baggies but Rose made a smart stop to frustrate Henriquez late on.
United: Amos; Varela, Evans, M.Keane, Blackett; Lingard (A.Pereira 82), Cole, Thorpe, Powell (Rothwell 79), Januzaj (Lawrence 78); Henriquez. Subs not used: Sutherland, Ekangamene.