The M in MLB might as well have stood for Mother on Sunday -- 'cause a bunch of players, including Phillies star Jose Alvarado, put their love for their moms on full display during their afternoons on the big league diamonds.
Take a look at Alvarado's cap as he came out of the bullpen during Philadelphia's 3-0 win over the Guardians at Progressive Field ... he had an adorable note written to his mom in silver ink.
"Happy Mother's Day," the message read.