In 1991, there were several notable no-hitters in Major League Baseball (MLB). Here are the pitchers who threw no-hitters that year:
1. **Nolan Ryan** of the Texas Rangers threw his seventh and final no-hitter on May 1, 1991, against the Toronto Blue Jays.
2. **Tommy Greene** of the Philadelphia Phillies threw a no-hitter on May 23, 1991, against the Montreal Expos.
3. **Dennis Martínez** of the Montreal Expos pitched a perfect game on July 28, 1991, against the Los Angeles Dodgers.
4. **Bret Saberhagen** of the Kansas City Royals threw a no-hitter on August 26, 1991, against the Chicago White Sox.
5. **Wilson Álvarez** of the Chicago White Sox pitched a no-hitter on August 11, 1991, against the Baltimore Orioles.
6. **Kent Mercker, Mark Wohlers, and Alejandro Peña** of the Atlanta Braves combined for a no-hitter on September 11, 1991, against the San Diego Padres.
These games were significant achievements for the pitchers and memorable moments in the 1991 MLB season.