At the beginning of the Japanese Baseball League (JBL), Yokozawa managed the Tokyo Senators in 1936–1937.[1] Yokozawa played second base for the team in one game in 1937, and had one plate appearance.[1]
Leaving managing, Yokozawa became an umpire in the JBL in 1938, working in that capacity through the 1944 season. Meanwhile, his old team the Senators, after a number of ownership and name changes, disbanded following the 1943 season. In 1946, Yokozawa looked to revive the franchise and soon founded the new Senators. He assembled a team of ready and able players, but as a newly formed team the Senators faced strict fiscal management and resorted to using hand-me-down uniforms from the Hankyu Railway's pre-war team, the Hankyu Club (who would eventually become the modern-day Orix Buffaloes). Former Japanese statesman Kinkazu Saionji, grandson of the influential Kinmochi Saionji, became the team's owner, and Noboru Oride, borrowing heavily from a Ginzacabaret proprietor, became the team's sponsor. Trapped by a lack of funds, Yokozawa was forced to resign as the team's manager after one season.[citation needed]