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Montgomery pitched five shutout innings against his former team to win his Cardinals debut
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Quintana allowed one run over six innings and struck out seven in his Cardinals debut
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Merrifield beat out an RBI infield single as part of a two-hit day in his Blue Jays debut
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Thor pitched a rain-shortened five-inning complete game to earn the victory in his Phillies debut
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Hosmer's 1st hit for the Red Sox was an RBI double in KC, where he was a World Series champ with the Royals
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Fans packed Petco Park to see Soto, who walked and scored in the first and then singled in the 8th for his first Padres hit
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Overshadowed by Juan Soto's arrival, Drury endeared himself to Padres fans quickly with a grand slam in his first at-bat
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An All-Star with the Orioles this year, López needed just 7 pitches to record his first Twins save with a 1-2-3 inning
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Castillo pitched like an ace in his Mariners debut, getting the first of 8 K's in a win in the Bronx
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Mancini has liftoff in Houston, launching his first home run as an Astro into the Crawford Boxes
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Robertson, a Phillie in 2019, finishes off a 1-2-3 9th vs. the rival Braves in his return to the club
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The Padres' new closer pitched a perfect 9th with 1 strikeout to earn the win in his debut
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Siri introduced himself to his new club and the Tampa Bay fans with a sweet sliding catch in the third inning of his debut