Chiba Lotte, which finished the regular season in third place in the Pacific League standings, won the title for the first time since former skipper Bobby Valentine was at the helm in 2005. The Marines became the first team in Japanese baseball history to win the title after finishing third in the standings.
Yoshifumi Okada knocked in the go-ahead run with a triple in the top of the 12th to propel the Marines.
The Marines' win capped off an exciting edition of the Japan Series, which featured the longest game in its history, as Saturday's Game 6 lasted 15 innings over six hours and 43 minutes before ending in a 2-2 tie, setting up Sunday's Chiba Lotte victory.
Bailey Stephens is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.