With the MLB regular season looking likely to be delayed for at least all of April and possibly beyond, we seem to facing the very real prospect of having a full missed season in combination with the 2020 season. This is actually not at all unusual in MLB baseball. The 1918 and 1919 MLB seasons were shortened to 140 games due to World War I and the Spanish flu pandemic.
Then there are the player strikes. In 1972, the season started 13 days late and the games were not made up, which meant not every team ended up playing the same amount of games.