Arrieta, who hasn't lost since July 25, started out August by throwing seven shutout innings in a 5-0 victory over the Pirates. He came back on Aug. 9 and pitched into the eighth inning without allowing a run in a win over the Giants, and he threw another quality start Aug. 15 against the White Sox.
The 29-year-old provided matching stat lines in his next two starts, when he went six innings and didn't allow any earned runs in wins over the Braves and Giants. Arrieta capped his month by making history on Sunday night, when he threw a no-hitter and struck out 12 batters in a 2-0 win over the Dodgers.
Arrieta allowed just two baserunners in that gem, one on an error and the other on a walk. He became just the seventh player in big league history to throw a no-hitter in the same season in which he lost a no-hitter. Arrieta's last loss came in a no-no thrown by Cole Hamels on July 25.
Arrieta was also named Pitcher of the Week on Monday, and he earned one other distinction in his historic game: Arrieta became the first big league pitcher since Hall of Famer Sandy Koufax in 1965 to finish off a no-hitter by striking out the side in order in the ninth inning.
Spencer Fordin is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.