On September 13, 2013 — Masahiro Tanaka of the Rakuten Golden Eagles improves to 21-0 in 2013, having won his last 25 decisions. He breaks Kazuhisa Inao’s 57-year-old Nippon Pro Baseball record for 20 consecutive wins in a season.

 


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Sources:
Baseball Reference September 13
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game