At this rate, we're going to end up with more than 20 no-hitters this season.
Corey Kluber of the Yankees threw the sixth no-hitter of the 2021 season last night. In the NL/AL era (since 1901), the most no-hitters in a season has been is seven, which has happened four times: 1990, 1991, 2012, 2015.
Kluber's gem obliterates the record for the earliest date of a season's sixth no-hitter by more than a month, though, the two seasons did not start on the same day. Opening Day was April 11 in 1917 and April 1 in 2021.