Kazuhiro Sasaki
Hasegawa was purchased by the Anaheim Angels in January 1997, and he pitched well as a setup man. He signed with the Seattle Mariners on January 14, 2002. In , Hasegawa was named to the American League All-Star team as a middle reliever. He converted 16 of 17 saves at the end of the season when Mariners closer Kazuhiro Sasaki was injured. He concluded the season with a 1.48 ERA in 63 relief appearances.