Thank you for asking.
Seattle remains a longshot to land Roki Sasaki but the Mariners ...
1. have a strong reputation of developing starting pitchers
2. have a solid record of maintaining the health of their starting pitchers
3. play their home games in MLB's most pitcher-friendly ballpark
https://baseballsavant.mlb.com/leaderboard/statcast-park-factors
4. have averaged 88+ wins over the past four seasons, landing one postseason berth, twice finishing one game behind the final Wild Care berth and once finishing two games back
5. return a relatively young core with multiple years of team control, losing only the likes of Jorge Polanco, Josh Rojas and Luis Urias (plus midseason acquisitions Justin Turner and Yimi Garcia)
6. currently employ Hisashi Iwakuma as a special assignment coach and Ichiro Suzuki as a special assistant to the chairman
7. play in MLB's closest market to Japan (4,769 air miles from Tokyo)