John Wesley "Jack" Glasscock (July 22, 1857 – February 24, 1947) was an American shortstop in Major League Baseball who played for several teams from 1879 to 1895 and was the top player at his position in the 1880s during the sport's bare-handed era. He led the National League in fielding percentage seven times and in assists six times, with both marks remaining league records until Ozzie Smith surpassed them in the 1980s; he also led the NL in double plays four times and in putouts twice. He won the 1890 batting title with a .336 average for the New York Giants and led the league in hits twice; in his final season he became the sixth major league player to make 2,000 hits. He was the first player to appear in over 600 games as a shortstop, and ended his career with major league records for games (1,628), putouts (2,821), assists (5,630), total chances (9,283), double plays (620) and fielding percentage (.910) at the position. When he retired he ranked fifth in major league history in games (1,736) and at bats (7,030), seventh in total bases (2,630) and eighth in doubles (313).

Jack Glasscock was born in Wheeling, West Virginia (then Virginia) to Thomas Glasscock (born 1830) and the former Julia Collette (born 1833), and dropped out of school in fourth grade to pursue his father's trade of carpentry. Nicknamed "Pebbly Jack" for his habit of scrutinizing the infield for small stones, typically pocketing them, the practice helped him to avoid the bad-hop ground balls which more regularly afflicted other infielders; fielding averages of the era rarely exceeded .900 among shortstops. He played for the local Standard club in 1876, the Champion City club of Springfield, Ohio in 1877, and the Pittsburgh Allegheny Base Ball Club of the International Association in 1878, the latter at third base. After Allegheny folded, he finished the season with Cleveland and broke into the National League with that club in 1879, the first West Virginian in the majors. After playing second and third bases as a rookie, he switched to shortstop permanently in 1880 with Fred Dunlap taking over at second. In 1881 he led the NL in putouts (105), assists (274) and fielding average (.911) for the first time. Over five seasons with the team he gradually improved his hitting, and in 1882 he was among the league's top ten players in home runs (4), doubles (27), slugging average (.450) and total bases (161) while also leading the league in assists (311) and tying Sadie Houck's major league record of 40 double plays, set the previous year; Frank Fennelly set a new major league mark with 46 for the 1885 in the American Association. In 1883, batting third, Glasscock led the team in runs batted in, and paced the NL in fielding again with a .922 average. In mid-1884 he jumped to the Cincinnati Outlaw Reds of the Union Association during that league's only season of play, and batted .419 in 38 games.

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