Tokyo Dome (aka ‘The Big Egg’) is home to the Yomiuri Giants. Love ’em or hate ’em, they're the most consistently successful team in Japanese baseball. Tickets usually sell out in advance; get them early at www.giants.jp/en/ticket.
Any tickets left on the day of the game are sold from the ticket office in front of the Dome's Gate 22 from 10am until the bottom of the 6th inning.