FA Cup round-up: Crewe fightback and force Blackburn Rovers replay while Jimmy Spencer scores a hat-trick to fire Mansfield past nine-man Guiseley.Crewe fought back from 3-0 down to force an FA Cup second-round replay in a 3-3 draw at nine-man Blackburn.Rovers raced into a 3-0 lead inside 20 minutes at Ewood Park as Dominic Samuel fired a double, either side of Danny Graham's effort.Crewe were handed a lifeline before the break when Blackburn's Rekeem Harper was shown a straight red card for his foul on Chris Porter, who picked himself up to convert the subsequent penalty.