Nayef Aguerd, Michail Antonio Lucas Paqueta struck for the Hammers.
Enzo Fernandez missed a penalty and West Ham had to play the final 25 minutes a player down after Aguerd saw red.
Seven minutes in and from his second corner in a claret and blue shirt, Ward-Prowse swung in a cross which Aguerd nodded in unmarked at the far post.But they were making inroads at the other end with Nicolas Jackson eager to get in behind West Ham’s back line. Paqueta was in the West Ham line-up despite being reportedly investigated by the Football Association for potential betting rule breaches.
Chelsea were gifted the chance to go ahead before half-time after Tomas Soucek tripped Raheem Sterling in the area, but Fernandez’s penalty was saved by Areola.
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