It this can I carry over my franchise from the MLB the show 19 to MLB the show 20? I don't want to loose my created players and their stats.

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Unless year to year saves feature is removed, you will be able to carry over your Franchise or RTTS save files from the Show 19 to the Show 20. Provided you play (or sim) through at least the 2019 season in MLB The Show 19.