Home debutant Nacer Chadli was involved in all his side's goals as West Bromwich Albion ran out 4-2 winners over West Ham United at The Hawthorns.
Chadli broke the deadlock from the penalty spot after Arthur Masuaku's handball, while Salomon Rondon's rifled a shot past Adrian to make it 2-0 after 37 minutes.
James McClean flicked in Chadli's effort to make it 3-0 at half-time, which quickly became four after the break as the former Spurs winger poked home Rondon's square pass.
Michail Antonio and Manuel Lanzini briefly gave West Ham hope with quickfire strikes but Tony Pulis' side dug in and held firm for victory.