This seems to be what happened last week:
Lost in extra innings
A game that is a no-hitter through nine innings may be lost in extra innings. On May 2, 1917, Fred Toney of the Cincinnati Reds and Hippo Vaughn of the Chicago Cubs pitched a hitless, scoreless tie after nine innings – the only time in baseball history that neither team has had a hit in regulation. The Reds got two hits in the top of the tenth inning and scored the winning run. In the bottom of the tenth, Toney retired the side and recorded a ten-inning no-hitter. (The closest any game has come since to having no hits in regulation was in 1965, when Sandy Koufax pitched a perfect game and opposing pitcher Bob Hendley of the Cubs gave up only one hit to the Dodgers, in the seventh inning.)
A total of thirteen potential no-hitters have been lost in extra innings; two were perfect games. In 1959, Harvey Haddix of the Pittsburgh Pirates pitched twelve perfect innings before losing the no-hitter and the game to the Milwaukee Braves in the thirteenth inning. Pedro Martínez, then a member of the Montreal Expos, was the last pitcher to lose a no-hitter in the tenth against the San Diego Padres in 1995. Vaughn, Haddix, Martínez, and the other ten pitchers who lost no-hitters in extra innings are not credited with official no-hitters because they did not keep the opponent hitless for the entire course of the game.
