Since the interleague format was introduced in Japan in 2005, the Pacific League has gotten the better of the Central League.

The PL is 520-487-25 against the CL in interleague play, with every title going to a PL team (Chiba Lotte Marines, 2005-06, Hokkaido Nippon Ham Fighters, '07, Fukuoka Softbank Hawks, '08-09, Orix Buffaloes 2010).

Among the many theories for this has been that the PL has better pitchers among other things.