Wrexham leapfrogged Mansfield into second place in League Two thanks to goals from Ollie Palmer, Paul Mullin and Andy Cannon.
Mullin and Palmer combined twice for first-half goals as the former's cross found the former AFC Wimbledon forward to head in the opener after 24 minutes. Some controversy occurred ahead of the second goal as Crewe midfielder Aaron Rowe's heavy challenge in Wrexham's half sparked an angry reaction from James McClean. Wrexham went on to score immediately after, as the free-kick was sent high up the pitch and Palmer nodded it on for Mullin to lift over the goalkeeper.
Things got worse for Crewe when Ryan Cooney was shown a red card for a handball in the middle of the field, and just five minutes later Wrexham were 3-0 up with a fine strike from Andy Cannon, boosting the Welsh team's hopes of finishing runners-up in League Two.