Since it's introduction in the 2002/03 season, the January transfer window has provided us with hope and drama.
Teams work hard to bring in reinforcements in a bid to strengthen their title challenge or their fight for survival.
But how many times do these buys, made in haste during a 31-day express window, work?
To find out we take a look at five hits and five misses in the history of the Premier League.
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