Nikkan Sports is reporting that Masahiro Tanaka (23) will be getting married to Mai Satoda (27) and that an announcement is expected. Tanaka has since posted an announcement of his intentions on his blog.
Tanaka met Satoda during Pro Yakyu All-Star Sports Festival in December 2009 and began dating in 2010. Later that year, in November, both Tanaka [blog post] and Mai [blog post] admitted that they were seeing each other.
UPDATE @ 8:27pm - The two plan to file marriage papers some time in late March.
UPDATE 1/28 @ 8:40pm - According to updated reports, the two could file marriage papers on either March 29 or March 30.
March 29 - Satoda's birthday. Falls on Butsumetsu, which symbolizes the day Buddha died and is considered an unlucky day, especially for marrying.
March 30 - Opening day. Falls on Taian, which is considered the "day of great peace" and would be a good day to get married. But since it is also opening day, the two would have to file marriage papers in the morning, before the start of the home opener.