Dirk Kuyt's 88th-minute goal sealed a 2-1 victory for Liverpool, knocking Manchester United out of the FA Cup and gaining revenge for their exit at the hands of their arch-rivals just over 12 months ago.
Park Ji-sung's equaliser just before half-time had looked like sending the tie to a replay after Daniel Agger's header had put the hosts ahead.
However, Kuyt, with only his second goal of the season, fired past David de Gea late on.
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