The winger struck in extra-time as the Hammers won the fourth round tie 1-0.
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Summerville said afterwards: "We know it was going to be difficult to come here. We dug in deep and they put pressure on us. For myself, when I came in I try to help the team and today was the day so I'm happy.
"These games are open and with my one v one I just tried to go inside and that's what I do best.
"I am in a good place lately. After my injury. I am just happy to be back on the pitch and I try to show this week in, week out."
He added: "Every game matters, even today. We have to keep the momentum, keep the positives and we go again next week."
