In previous seasons, MLB games that were called because of rain before they reached the "official" five-inning count got erased from record. Teams would then replay those contests from scratch at a later date.
This year, though, baseball has a new approach. Instead of those games being struck outright, they will be allowed to resume where they left off. So, a 3-1 score in the third inning would stay that way rather than be reset to 0-0 in the top of the first.
Suspended games are not entirely new for the league. When official games beyond the fifth inning are tied or are still in an inning in which the visiting team took the lead, for example, they continue from that point whenever the matchup is rescheduled. That happened with a contest between the A's and Tigers last year, in fact, and led to statistical oddities.
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Among the rule changes for 2020 MLB action, the rain delay tweak is fairly minor. Baseball implemented a universal DH and decided to begin each extra inning with a runner on second base. There are also no fans in the stands this year because of the COVID-19 pandemic.
The season opener between the Yankees and Nationals showed it could still be a factor, especially if inclement weather arrives during a playoff matchup.
Rain hit D.C. in the sixth inning, but because New York led 4-1 and the game was past the fifth inning, the Yankees were awarded the win. If it had been before the end of the fifth, then the game would have resumed at 4-1 before the next game or on a mutual off-day.