Chicago's rookie hit a two-run shot in the first and a grand slam in the second to make it 7-0 early, as he recorded his second multihomer game of the season. His second-inning slam was the second of his season, becoming the first Cubs' rookie to have two in a season since Hall of Famer Billy Williams in 1961.
After his first-inning home run nearly left the ballpark, Bryant's grand slam barely got over the wall in the second.
Jarred Cosart gave up seven runs on four hits and three walks in just 1.2 innings, as his record fell to 1-4 on the year. He was making his first start after a month off with vertigo, but was optioned to Triple-A New Orleans after the game.
Clayton Richard notched his first win of the season, as he pitched into the seventh inning in his first major league outing since 2013. He was acquired from the Pittsburgh Pirates in a trade on Friday, and gave up two runs on eight hits in 6.1 innings. The win was the fourth in five games for the Cubbies.
Chicago would go on to clinch a series victory by shutting out Miami 2-0 behind a dominant performance from Kyle Hendricks on Sunday. They will host the St. Louis Cardinals on Monday night, while the Marlins will visit the Boston Red Sox starting Tuesday.