The young striker took his tally to 20 goals in all competitions this season and helped us get off to the perfect start at The Hawthorns.
Christian Eriksen curled home another delightful free-kick before Mousa Dembele provided Harry with the ammunition to rifle home for 2-0 - both inside 15 minutes.
Hugo Lloris made two key saves in West Brom’s best spell - they also struck the crossbar - but it was all over when Harry slotted home from the penalty spot on 65 minutes after Jolean Lescott handled Kyle Walker’s cross.
“We wanted to get off to a fast start and get ahead in the game,” reflected Harry.
“We scored two quick goals and we said in the second half that we had to remember what happened at Sheffield United, we had to keep playing and try and get the third goal. We did that and in the end it was quite comfortable for us.”
Harry was full of praise for Hugo, who produced top-drawer saves to keep out James Morrison and Claudio Jacob as the home team pushed forward at 2-0.
“He’s a top-class goalkeeper and I’ve said that time and time again,” added Harry. “He’s saved us on many occasions and he did it again at vital moments in the game. That’s what you need from your goalkeeper.”