This is a site about Pro Yakyu (Japanese Baseball), not about who the next player to go over to MLB is. It's a community of Pro Yakyu fans who have come together to share their knowledge and opinions with the world. It's a place to follow teams and individuals playing baseball in Japan (and Asia), and to learn about Japanese (and Asian) culture through baseball.
It is my sincere hope that once you learn a bit about what we're about here that you will join the community of contributors.
Michael Westbay
(aka westbaystars)
Founder
In 23 seasons, Yoshii has traveled from Kintetsu to Yakult, then the Majors (where he pitched for Bobby's Mets among other teams), returning to play for Orix. He's started 10 games so far this season, with 1 win, 6 losses, and a 5.75 ERA over 40 2/3rd innings.
Hirashita has only played in 5 games this season for Lotte, mainly as a defensive replacement. He's 0 for 2 at bats this season.
In the linked Sanspo article, Valentine-kantoku says that Yoshii is there to fill a hole in the Marines' pitching rotation should one open up.