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Gabriel Agbonlahor's 15th-minute effort has given Paul Lambert's side the advantage at the interval.
The goal came after a swift counter-attack saw the ball released to the pacy
Agbonlahor, and he dodged a tackle from Dejan Lovren before sliding the ball into the corner.
Nathan Baker could have made it 2-0 seven minutes later, but the defender failed to connect properly with a header from a well-delivered corner.