Octavio Antonio Fernández Castro, better known as Tony Fernández, was a Dominican baseball player who played as a shortstop in Major League Baseball (MLB) for seven teams from 1983 to 2001, most notably the Toronto Blue Jays. A five-time All-Star, Fernández was known for his defensive skills, winning four consecutive Gold Glove Awards (1986–1989). He batted over .300 four times, led the major leagues with 17 triples in 1990, collected 30 doubles six times and 20 stolen bases seven times. He also led American League shortstops in assists three times, and in putouts and fielding average twice each. After moving to the National League in a blockbuster trade following the 1990 season, he returned to the Blue Jays in a mid-season trade in 1993, and played a major role in helping the club repeat as World Series champions, batting .333 with nine runs batted in during the series.

Shortstop, abbreviated SS, is the baseball or softball fielding position between second and third base, which is considered to be among the most demanding defensive positions. Historically, the position was assigned to defensive specialists who were typically poor at batting and were often placed at the bottom of the batting order. Today, shortstops are often able to hit well and many are placed at the top of the lineup. In the numbering system used by scorers to record defensive plays, the shortstop is assigned the number 6.