Mets hitting guru Donnie Stevenson reappears on Pete Alonso's InstagramAlonso took on the alter ego earlier in the season6/17/2021, 10:45 PMColin MartinFreelance Editorial ProducerApr 13, 2021; New York City, New York, USA; New York Mets first baseman Pete Alonso (20) at Citi Field. / Wendell Cruz-USA TODAY Sports