At Bennett Park, the Tigers and Senators play the longest scoreless game in American League history. Ed Summers pitches the complete game, holding the Nationals to seven hits, two walks (one intentional), while fanning 10. The Nationals’ 30-year-old rookie, Bill “Dolly” Gray, allows only one hit before leaving with an injury after eight innings. He is replaced by Bob Groom. Gray will put another entry in the record books next month when he walks seven straight batters. The 0 – 0 contest is called after the 18th inning.

On July 16, 1909 At Bennett Park, the Tigers and Senators play the longest scoreless game in American League history. Ed Summers pitches the complete game, holding the Nationals to seven hits, two walks (one intentional), while fanning 10. The Nationals’ 30-year-old rookie, Bill “Dolly” Gray, allows only one hit before leaving with an injury after eight innings. He is replaced by Bob Groom. Gray will put another entry in the record books next month when he walks seven straight batters. The 0 – 0 contest is called after the 18th inning.

Source
Baseball Reference July 16