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Graham Potter believes his side "need to do better in the big moments" after West Ham concede three second-half goals to lose 3-0 to Sunderland at the Stadium of Light.
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Graham Potter
Graham Potter
Sunderland's Luke O'Nien
Sunderland's Luke O'Nien
Benjamin Sesko
Benjamin Sesko
Richard Masters
Richard Masters
Florian Wirtz
Florian Wirtz