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Giant Killers at Euro 2016: Identifying group-stage Davids and Goliaths

Hakan Calhanoglu and Turkey could play spoiler in Group D at the Euros. Alex Livesey/Getty Images

With the UEFA European Championships kicking off on Friday, which teams could pull off big upsets? To find out, we subjected the Euros to the same kind of Giant Killers analysis Jordan Brenner and I have developed for college basketball, where we search for Davids who can upend Goliaths during March Madness.