On an afternoon which saw thousands of home fans walk out of Anfield late in the second half in a protest over ticket prices, Liverpool had led 2-0 with goals from Roberto Firmino (59) and Adam Lallana (70).
Firmino headed in at the back post from James Milner's cross and the Brazilian then turned provider for Lallana to make it 2-0, which looked to have provided a tonic for Liverpool manager Juergen Klopp, who was absent after suffering suspected appendicitis.
Yet Johnson pulled one back on 82 minutes when keeper Simon Mignolet allowed his freekick to squirm past him and Defoe completed a fine fightback when he turned and smashed home a minute from time.
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(Reporting by Justin Palmer, Editing by Ian Chadband)
