| Tuesday, December 30th , 1958 | Signed free agent SP Mitsuhisa Okamoto to a minor league contract. | Sunday, December 28th , 1958 | Signed free agent C Tsumemasa Shiba to a minor league contract. | Wednesday, December 24th , 1958 | Signed free agent C Tsumemasa Shiba to a minor league contract. | Friday, December 19th , 1958 | Signed free agent SP Mitsuhisa Okamoto to a minor league contract. | Tuesday, December 16th , 1958 | Signed free agent RP Teppei Kaneko to a minor league contract. | Signed free agent RP Fujimaro Taira to a minor league contract. | Saturday, December 13th , 1958 | Signed free agent RP Teppei Kaneko to a minor league contract. | Signed free agent RP Botan Kawamoto to a minor league contract. | Monday, December 8th , 1958 | Signed free agent LF Yoshisato Sasaki to a minor league contract. | Saturday, December 6th , 1958 | Signed free agent SP Katsura Nagata to a minor league contract with a major league option. | Released SP Katsura Nagata. | Signed free agent RP Kikunojo Sakoda to a minor league contract. | Signed free agent RP Yuya Rin to a minor league contract. | Wednesday, December 3rd , 1958 | Signed free agent LF Yoshisato Sasaki to a minor league contract. | Signed free agent 3B Chikato Sato to a minor league contract. | Friday, November 28th , 1958 | Signed free agent RP Nikki Uesugi to a minor league contract. | Signed free agent SP Fujio Kanazawa to a minor league contract. | Tuesday, November 25th , 1958 | Signed free agent LF Yoshisato Sasaki to a minor league contract. | Sunday, November 23rd , 1958 | Signed free agent RP Nikki Uesugi to a minor league contract. | Saturday, November 22nd , 1958 | Released RP Yuya Rin. | Friday, November 21st , 1958 | Signed free agent RP Yuya Rin to a minor league contract. | Sunday, November 16th , 1958 | Signed free agent 3B Chikato Sato to a minor league contract. | Wednesday, November 12th , 1958 | Released RP Yuya Rin. | Signed free agent SP Kazumi Yoshida to a minor league contract. | Tuesday, November 11th , 1958 | Signed free agent RP Yuya Rin to a minor league contract. | Tuesday, November 4th , 1958 | Signed free agent RF Masaki Murakami to a minor league contract. | Signed free agent CF Totaro Nakashima to a minor league contract. | Wednesday, October 29th , 1958 | Signed free agent RP Kikunojo Sakoda to a minor league contract. | Signed free agent SP Hirokatsu Yamada to a minor league contract. | Friday, October 24th , 1958 | Released RP Yuya Rin. | Signed free agent 3B Chikato Sato to a minor league contract. | Thursday, October 23rd , 1958 | Released 3B Chikato Sato. | Signed free agent RP Yuya Rin to a minor league contract. | Wednesday, October 22nd , 1958 | Signed free agent 3B Chikato Sato to a minor league contract. | Saturday, October 18th , 1958 | Signed free agent SP Kazumi Yoshida to a minor league contract. | Saturday, October 11th , 1958 | 3B Tsuneyo Ota retired from professional baseball. | Thursday, October 2nd , 1958 | Signed free agent 3B Chikato Sato to a minor league contract. | Signed free agent SP Mitsuhisa Okamoto to a minor league contract. | Monday, September 29th , 1958 | Signed free agent 3B Chikato Sato to a minor league contract. | Signed free agent SP Shigeharu Matsushima to a minor league contract. | Friday, September 12th , 1958 | Signed free agent 3B Chikato Sato to a minor league contract. | Wednesday, September 10th , 1958 | Signed free agent RP Koudo Takara to a minor league contract. | Wednesday, September 3rd , 1958 | Signed free agent RP Yoshitaka Date to a minor league contract. | Wednesday, August 27th , 1958 | Signed free agent RP Niou Nagao to a minor league contract. | Thursday, August 21st , 1958 | Signed free agent LF Shinpei Abe to a minor league contract. | Released RP Nikki Uesugi. | Monday, August 11th , 1958 | Signed free agent RF Kaiji Araki to a minor league contract. | Released RF Kaiji Araki. | Saturday, August 2nd , 1958 | Signed free agent SP Shuukou Takata to a minor league contract. | Signed free agent 3B Tenshin Shibata to a minor league contract. | Friday, July 25th , 1958 | Signed free agent SP Keisei Doi to a minor league contract. | Released SP Keisei Doi. | Monday, July 21st , 1958 | Signed free agent SP Keisei Doi to a minor league contract. | Released SP Keisei Doi. | Saturday, July 19th , 1958 | Signed free agent LF Yoshisato Sasaki to a minor league contract. | Sunday, July 6th , 1958 | Signed free agent LF Yoshisato Sasaki to a minor league contract. | Monday, June 16th , 1958 | Signed free agent RF Kaiji Araki to a minor league contract. | Released RF Kaiji Araki. | Sunday, June 15th , 1958 | Signed free agent RP Kozo Miyaji to a minor league contract. | Released RP Kozo Miyaji. | Monday, June 9th , 1958 | Signed free agent SP Hirokatsu Yamada to a minor league contract. | Signed free agent RP Nikki Uesugi to a minor league contract. | Thursday, June 5th , 1958 | Drafted SS Fujimaro Sonoda in the 1958 first-year player draft (Round 1, Pick 10, 10th overall pick). | Drafted CL Maris Kaneko in the 1958 first-year player draft (Round 2, Pick 10, 22nd overall pick). | Drafted SP Kazumi Yoshida in the 1958 first-year player draft (Round 3, Pick 10, 34th overall pick). | Drafted RP Fujimaro Taira in the 1958 first-year player draft (Round 4, Pick 10, 46th overall pick). | Drafted SS Toshimitsu Nagamine in the 1958 first-year player draft (Round 5, Pick 10, 58th overall pick). | Placed SP Masatoshi Sakai on the 14-day injured list. | Thursday, May 15th , 1958 | Signed free agent RF Ssekien Ikeda to a minor league contract. | Tuesday, April 29th , 1958 | Signed free agent CF Totaro Nakashima to a minor league contract. | Tuesday, April 22nd , 1958 | Signed free agent SP Goro Nagata to a minor league contract. | Saturday, April 19th , 1958 | Signed free agent RF Ssekien Ikeda to a minor league contract. | Saturday, April 12th , 1958 | Signed free agent SP Goro Nagata to a minor league contract. | Thursday, April 10th , 1958 | Signed free agent SP Goro Nagata to a minor league contract. | Tuesday, April 8th , 1958 | Signed free agent 3B Tenshin Shibata to a minor league contract. | Saturday, April 5th , 1958 | Signed free agent C Tsumemasa Shiba to a minor league contract. | Tuesday, April 1st , 1958 | Signed free agent RF Ssekien Ikeda to a minor league contract. | Signed free agent SP Yasuomi Daidoji to a minor league contract. | Saturday, March 29th , 1958 | Signed free agent RP Naotake Fukushima to a minor league contract. | Tuesday, March 18th , 1958 | Signed free agent 3B Tenshin Shibata to a minor league contract. | Signed free agent SS Haruhiro Nonaka to a minor league contract. | Signed free agent SP Toru Inoue to a minor league contract. | Sunday, March 9th , 1958 | Signed free agent C Tsumemasa Shiba to a minor league contract. | Friday, February 28th , 1958 | Signed free agent 3B Tenshin Shibata to a minor league contract. | Tuesday, February 25th , 1958 | Signed free agent SS Harumi Kawai to a minor league contract. | Friday, February 21st , 1958 | Signed free agent SP Goro Nagata to a minor league contract. | Wednesday, February 19th , 1958 | Signed free agent 3B Tenshin Shibata to a minor league contract. | Friday, February 14th , 1958 | Signed free agent RF Washichi Usui to a minor league contract. | Signed free agent RP Naotake Fukushima to a minor league contract. | Monday, February 10th , 1958 | Signed free agent RP Manabu Shiotani to a minor league contract. | Friday, February 7th , 1958 | Signed free agent C Tsumemasa Shiba to a minor league contract. | Saturday, February 1st , 1958 | Signed free agent RP Kikunojo Sakoda to a minor league contract. | Signed free agent SP Yasuomi Daidoji to a minor league contract. | Tuesday, January 28th , 1958 | Signed free agent SP Yasuomi Daidoji to a minor league contract. | Tuesday, January 21st , 1958 | Signed free agent RP Manabu Shiotani to a minor league contract. | Friday, January 17th , 1958 | Signed free agent RP Naotake Fukushima to a minor league contract. | Sunday, January 12th , 1958 | Signed free agent RP Koudo Takara to a minor league contract. | Saturday, January 4th , 1958 | Signed free agent SP Sadakazu Minami to a minor league contract. | Signed free agent SS Harumi Kawai to a minor league contract. | Signed free agent SP Toru Inoue to a minor league contract. | Thursday, January 2nd , 1958 | Signed free agent RF Washichi Usui to a minor league contract. | | |