In case Katy Perry hasn't already solidified the term in the lexicon, a dark horse in the broadest sense is a little-known contender in a competition who performs unexpectedly well.
The Green Bay Packers have numerous dark horse players on their roster—players who could survive final cuts despite being unlikely bets. Perhaps the players are former undrafted free agents, or undrafted rookies, or on the bubble despite being on the roster in the past.
Performances at training camp can and likely will muddle all these pre-camp projections, but for now, let's break down five borderline players who did enough in the offseason so far to earn consideration for the final 53-man roster.