Hall of Famer Frank Robinson was taken by ambulance to a hospital Thursday with dizziness and a rapid heartbeat.
Commissioner Bud Selig said tests on the 75-year-old have been negative for any serious problems.
Robinson was at a Phoenix-area resort as baseball's owners concluded two days of meetings.
Robinson was in a meeting of owners and general managers when he fell ill. MLB spokesman Pat Courtney says Robinson walked out on his own, then was taken to a hospital for observation.
A member of the Hall of Fame since 1982, Robinson is senior vice president for baseball operations in the commissioner's office.