The Seattle Mariners and Oakland Athletics arrived in Japan on Friday in preparation for the opening of Major League Baseball's 2012 season at Tokyo Dome.Mariners outfielder Ichiro Suzuki received a warm reception from about 300 fans at Tokyo's Narita Airport. The teams open a two-game series on Wednesday."We're thrilled to be back in Japan," Oakland general manager Billy Beane said. "When they asked who wanted to go we were the first to put up our hands."Both teams will play exhibition games against the Yomuri Giants and Hanshin Tigers on Sunday and Monday.Wednesday will mark the fourth opener in Japan, and the first since 2008.