Guy Jackson Hecker (April 3, 1856 – December 3, 1938) was an American professional baseball pitcher and first baseman.

[1] In 1877, Hecker started his professional baseball career with the Springfield Champion City of the League Alliance.

[2] After that season, Hecker moved back to Oil City, got married, and played for local teams through 1881.

[1] In 1882, Hecker joined the Louisville team of the new AA as a first baseman and backup pitcher to Tony Mullane.

[3] On September 19, 1882, Hecker became the second AA pitcher to throw a no-hitter; his teammate Mullane had thrown one a week earlier.

[5] Hecker was a power pitcher early in his major league career, with his key pitch being a "hard overhand drop curve.

[1] He also developed a rivalry with Louisville's new top pitcher, Toad Ramsey, which threatened to split the team.

This forced Hecker to abandon his usual "running start" delivery and hurt his performance.

[1] During Hecker's major league career, he appeared in 336 games as a pitcher, 322 as a first baseman, and 75 as an outfielder.