Arizona Diamondbacks pitcher Tyler Gilbert tossed the no-hitter as the team defeated the San Diego Padres 7-0 at Chase Field in Phoenix.
Gilbert, making his first career start, struck out five batters and walked Padres outfielder Tommy Pham three times.
The record for most no-hitters thrown in a given year is eight, which was set in 1884 and matched this season. Before this, the most no-hitters in any modern-era season since 1900 was seven, happening in 1990, 1991, 2012, and 2015, according to Major League Baseball.
Madison Bumgarner of the Arizona Diamondbacks also no-hit the Atlanta Braves in April, but the performance did not count as an official no-hitter because the game was shortened to seven innings for a doubleheader that day.