Mattis is an elite discus thrower touting a PR of 67.45m. He currently trains as a Garage Strength athlete under Dane Miller. Mattis competed in the 2016 US Olympic Trials and earned a ninth place finish in the final round. During his illustrious career as a collegiate athlete for the University of Pennsylvania, Mattis was a four-time Ivy League Outdoor Champion and 2015 NCAA National Champion in the discus throw.

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