Motley, a right-handed hitting outfielder, hit a 2-run home run for the Royals against the St. Louis Cardinals in Game 7 of the 1985 World Series to give Kansas City an early 2–0 lead. Motley's home run into the left field bleachers came on a 3–2 pitch, after he had hit the preceding 3–2 pitch to the same area in the stands, but foul. Motley, upon seeing the ball curve foul, slammed his bat into the home-plate area, breaking it. After selecting a new bat from the bat-boy, Motley delivered the fatal blow to the Cardinals. He also caught Andy Van Slyke's fly ball for the final out of the Series.
He also played 4 years for the Fargo-Moorhead Redhawks of the Northern League, from 1996 to 1999. In the team's inaugural season in 1996, Motley hit an impressive .346 with 26 home runs and 103 RBI in 82 regular season games.