The couple announced their engagement on Instagram, with Kopech posting a video showing him propose at a waterfall in Mooney Falls, Ariz.
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Kopech wrote in part, "I'm incredibly humbled by the love that you give and I only hope I can portray a fraction of the love and light that you carry with you."
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Kopech, 23, made his Major League debut with the White Sox last year and is currently out injured after undergoing Tommy John surgery.