The win moved the Baggies into the top half of the table.
Somen Tchoyi scored the opener for the Baggies while Peter Odemwingie baged a brace in the second half.
“I thought that we played very well today, from the start to the end, we scored some great goals as well and we controlled the game the majority of time,” Di Matteo said.
He added: “I think we pressed them quite high up the pitch, we never let them settle in and we recovered possession quite often with that.
“I thought the first goal was an excellent goal and I think the second one came exactly from pressing them and the third one probably as well.”
