The 28-year-old batted .304 with 10 home runs and 63 RBIs in 144 games for a Mariners team that barely missed the playoffs in the American League last year. He also scored 91 runs and was named to the American League All-Star team in just his second season with the team. He had agreed to a five-year, $70 million contract in June of 2017, which keeps him under contract through the 2022 season. He does have a $17 million option for 2023 and a $1 million buyout.
The 32-year-old Santana is the other most recognizable name in this deal, and the first baseman spent just one season with the Phillies. In his lone year with them, he hit .229 with 24 home runs and 86 RBIs, which is typical for the former catcher. He signed a three-year, $60 million contract with Philadelphia last off-season with an option for the 2021 campaign. He joins Jay Bruce as veteran sluggers that Seattle has added in their last few trades.
Pazos is a 27-year-old pitcher and went 4-1 with a 2.88 ERA in 50 innings out of the bullpen last season, while Nicasio was 1-6 with a 6.00 ERA out of the bullpen. This will be the 32-year-old's second stint with the Phillies, as he also spent time there in 2017.
With Santana gone from Philadelphia, the Phillies are expected to move Rhys Hoskins back to first base from the outfield. Meanwhile, the Mariners are bound to have a much older lineup in Safeco Field next season, as they look to bring more young talent up in their system.