Who the Mariners got
Left-handed reliever Zach Duke from the Twins and right-handed reliever Adam Warren from the Yankees.
Zach Duke is a long-time pitcher in the league that is a reliever turned starter. He struggled pretty badly as a starter, but since being converted to a reliever he’s been pretty good with the exception of the 2013 season. Duke will be a nice piece to add to the Mariners’ bullpen.
Adam Warren has been good during his career, especially during his time spent with the Yankees. He has a career ERA of 3.40 and he has the ability to give some length out of the bullpen, making him an interesting piece to add.
Overall the Mariners made their bullpen better with these moves by adding some pieces that will give Scott Servais some options. They really need to boost their starting rotation, but at least they are adding some depth to their bullpen to make up for the fact they might not go out and get a starter before the deadline.
Who the Twins got
Minor league right-handed pitcher Chase De Jong and minor league infielder Ryan Costello.
Chase De Jong has seven career major league appearances and he’s been horrible in those, posting a 6.35 ERA. He also doesn’t have an overly-impressive minor league ERA with a 3.95 career minor league ERA. I’d be surprised if he ever ended up being anything for the Twins.
Ryan Costello is a 22-year old infielder who was a 31st-round pick in the 2017 draft. He hit .331 in the Arizona Rookie League last season, but has struggled a little bit more after making the jump to single-a this season.
Overall the Twins didn’t get much in this trade in my opinion, but they were only giving up an older reliever so it makes sense.
What the Yankees got
International signing bonus money. The Yankees have been really good in international scouting, so this could be very useful to them. More useful than getting a prospect from a Mariners farm system that’s pretty weak.
Adam Warren is pretty good, but with the depth of the Yankees bullpen he was pretty expendable for them.