Blue Jays - Erik Swanson
The Mariners traded Swanson last offseason in a deal to acquire Teoscar Hernandez. It was a relatively low risk move, but with a need in the bullpen, the Mariners could return a familiar face. Swanson was really good again in 2023, throwing 66.2 innings with 2.97 ERA and really impressive 10.1 K/9 and 2.8 BB/9 numbers. He would slot in right next to Topa as the 3rd/4th option in the pen. Plus, he is under control through 2025, giving some stability and control.
Orioles - Anthony Santander
Santander is a rental bat slated to make just over $14 million this year. He fits in really well with this club as he has a career 108 wRC+, a very solid 21% K% for a power hitting outfielder. He has hit 61 home runs in the last 2 years while slugging over 450 in both years. Santander give some versatility, being able to play both corner outfield spots and some first base if needed.
Rays - Josh Lowe
I proposed a trade for Josh Lowe a few weeks back. The Mariners line up extremely well with the Rays as trade partners and Josh Lowe is one of my favorite outfielders and would fit perfectly into this lineup. He slashed .292/.335/.500 with 20 home runs and 32 stolen bases while putting up a 131 wRC+ and a 3.8 fWAR, in his first full season in the big leagues. He could hit anywhere in the lineup 1-9 and fits the club's emphasis on limiting strikeouts with a strikeout rate of 24.8%.
Red Sox - Alex Verdugo
There have been a lot of rumors surrounding Verdugo this offseason, and a few have linked him to the Mariners. He is an interesting target, and he doesn't strikeout much at all with a career K% of 15.1%. He doesn't have a ton of power with just 13 home runs in 2023, tied for a career high, as well as a career slugging percentage of .428, but he would be a solid addition to the lineup as the 3rd best bat added this offseason. There are some concerns about his fit in the locker room, which will ultimately come down to Dipoto and co. doing their due diligence on that side of things.
Yankees - Gleyber Torres
Sticking with the theme of limiting strikeouts, as evidence of the recent Geno trade, Gleyber Torres fits in perfectly. A career 20.3% strikeout rate and a .454 slugging percentage fits the team perfectly. He is a rental bat, but would give them a solid 2nd base option, allowing Rojas and Urias to platoon at third base.