What will the Mariners outfield look like on Opening Day 2020?

Odd One Out
Santana will not be in the Mariners outfield next year and is unlikely to still be with the team. Arguably the most likely of the current group of outfielders to get traded, Santana would be tough to fit into the Mariners outfield next year.
His defensive blunders this year have been tough to stomach, but his offensive output has made him a consistent threat in the Mariners lineup. With that said though in today’s game it’s hard to fit one, let alone two, bat first players onto a Major League roster.
Unless they decide to move Santana to first base (and he proves he can handle the position), there isn’t room for him and All-Star Daniel Vogelbach in Seattle since neither provides defensive value. Since Santana does offer some value on the base paths his market would be larger than Vogelbach’s as teams will always be on the lookout for players with his offensive skill set.
The Holdover
Smith is the next holdover that will be in the outfield come the start of the 2020 season. I almost left him off as I believe Trader Jerry could look to move him in the offseason, but I doubt the Mariners will want to break in two rookie outfielders at the start of the year. Smith has been much better since his call up from Tacoma, but look for Smith to be playing left field next year instead of center.