Williamson says his life "hasn't been the same" since the injury. The 30-year-old suffered a concussion in 2018 when he tripped over a bullpen mound at Oracle Park and hit his head on the wall. He claims that he's suffered through continued symptoms, including "nausea, trouble sleeping, mood swings, and other issues." Williamson last played in the majors in 2019 and played in the Korea Baseball Organization this past season. The Giants moved their bullpens beyond the center field fence this year, an acknowledgement of the danger involved. It's unclear where things will go from here, but the team says Williamson's claims would be better resolved through MLB's grievance system and worker's compensation program.

The 29-year-old hasn't put things together over parts of five seasons in the big leagues, hitting .203/.282/.348 in 483 plate appearances. He played 40 games for the Samsung Lions of the KBO last season after getting designated for assignment by the Mariners, but his .273/.327/.409 line there doesn't exactly suggest he suddenly figured things out.

WIlliamson's rights remain with the Mariners after he recently accepted an outright assignment to Triple-A Tacoma, but he'll likely be released from his obligations to the organization while he pursues what's presumably a more lucrative opportunity overseas. The 29-year-old Williamson has posted some eye-popping numbers in the Triple-A ranks over the past three seasons, but his 28.8 percent career strikeout rate has prevented him from finding much sustained success in the majors. He could emerge as one of the KBO's top power hitters while having the luxury of teeing off against pitchers who typically work at lower velocities than their MLB counterparts.

Williamson will remain in Seattle's organization after being designated for assignment by the Mariners and subsequently passing through waivers unclaimed. The outfielder is slashing just .156/.250/.258 with four home runs and two stolen bases in 144 big-league plate appearances this season.