What happened: New York acquired an on-base-oriented second baseman, an athletic outfielder and a right-hander with a varied arsenal. The package gives the Mets prospects at different stages of development.

Why it matters: Peralta was a rental, making future value the central measure of the deal for New York. Tampa Bay adds a starting pitcher while the Mets replenish their system.

What to watch: Watch how the Mets develop the package and where Peralta slots into Tampa Bay's rotation.