These guys hit the Mariners well, but it's not a big sample
Shane Victorino: 23-50, .460/.509/.880, 4 2B, 5 HR, 13 RBI, 14 R
That's alot of damage in only 50 ABs. I always try and remember to stretch it out and see what it would look like over a full season to get a better idea of the damage, and oh boy does Victorino dominate. OBP over 50% is remarkable, and the 20% XBH rate is insane as well. He easily hit the best against the Mariners, and the next closest team was the Rockies with a .330 BA.
Andres Galarraga: 24-53, .453/.500/.792, 6 2B, 4 HR, 11 RBI, 13 R
The Big Cat. Pretty sure that anyone around 30 or younger probably isn't really familiar with Galarraga. He had a 20-year career, but he did the most damage as a member of the Colorado Rockies. Double digit XBH, Runs, and RBI were notched similar to what Victorino did. It's not just the Mariners, though, as he hit 399 HR and 444 2B in his career, but the Mariners were by far the team he had his way with.
Edouard Julien: 11-24, .458/.552/.917, 1 3B, 3 HR, 4 RBI, 7 R
You might recognize Julien, as he was on the 2023 list. Yup, you read that right. He did all that just in one season against the Mariners. Hopefully he goes back to the norm and just hits normal against Seattle in 2024.