 In addition, the introduction of interleague play in 1997 has pitted the two teams against each other for usually six games every season since 1997, three in each city (but only four in 2013, two in each city).Before 1997, they played each other only in Cactus League spring training.Their interleague play wins and losses (63–57 in favor of the A's) have been fairly evenly divided despite differences in league, style of play, stadium, payroll, fan base stereotypes, media coverage and World Series records, all of which have heightened the rivalry in recent years.