On July 12, 1997In Pittsburgh’s first non-Opening Day sellout since 1977, a crowd of 44,119 sees Francisco Cordova and Ricardo Rincon combine on a 10-inning no-hitter as the Pirates down the Astros, 3 – 0, on a 10th-inning pinch home run by Mark Smith. Cordova hurls the first nine innings while Rincon hurls the 10th and gets the win. The victory keeps the Pirates in a tie for 1st place with the Astros in the NL Central.
Source
Baseball Reference July 12