[2] However, he had an impressive showing at an "all comers" Chicago White Sox tryout, and scout Bill Lentini signed him as an amateur free agent on August 19, 1969.

On the first pitch of his first inning in his first Major League game, he severely damaged his knee making a diving catch near third base, sliding down the dugout steps and landing on the 60-day DL.

Downing was dealt along with Chris Knapp and Dave Frost from the White Sox to the California Angels for Bobby Bonds, Richard Dotson, and Thad Bosley on December 5, 1977.

Although his range was not great for an outfielder, Downing's hard work and steady hands allowed him to play the entire 1982 and 1984 seasons without making an error.

On April 9, 2009, Downing was to be inducted into the Angels Hall of Fame along with former teammate Chuck Finley before the start of the game that day.

However, due to the death of Angels rookie pitcher Nick Adenhart, the ceremony and game were postponed until August 27.