From BR Bullpen
A suspended game is a game that is stopped while being played and completed at a later date. The rules governing suspended games have changed a number of times, most recently before the 2007 season. A number of circumstances can lead to a suspended game, the most common being a game that has gone for 4½ innings and is stopped by weather when the visiting team has just tied the score or taken the lead. Because the home team has not had as many turns at bat as the visitors, the game is suspended until the remainder can be played (in other cases, the game may simply be called a tie and later replayed in its entirety if it affects the result of the pennant race). Another common instance is when a tie game is stopped by a curfew.
Because there can be a significant amount of time elapsed between the start of a suspended game and the date of its completion, it can lead to strange situations in which a player is listed in playing a game taking place before his major league debut or while he was with another team (the date on which the game started is considered the game's date, and not the date at which it was completed).
 Further Reading
- Stephen D. Boren: "Anomalies of Protested and Suspended Baseball Games", The Baseball Record Journal, SABR, Volume 41, Number 2 (Fall 2012), pp. 14-20.