Phil Parkinson's Wrexham side holds a unique place in FA Cup history, most notably for their 4-2 shock victory over Premier League leaders Chelsea in 2015. That stunning result, where Bradford City (Parkinson's former club) overturned a 2-0 deficit, remains Chelsea's only home defeat in the competition that season. Parkinson, now Wrexham's manager, vividly recalls the disbelief in Jose Mourinho's eyes during that match.

His team's spirit and belief, honed in lower divisions, became his trademark. Today, Parkinson leads Wrexham, a non-league club now aiming for the Championship play-offs, carrying the same underdog mentality that defined his Bradford days. The 2015 upset isn't just a memory; it's a blueprint for challenging giants like Chelsea on Saturday.