The right-hander was signed by the Atlanta Braves as an amateur free agent out of Manhattan College in 1981. Hank Aaron was present at Waddell's tryout and credited with signing the young pitcher. After three seasons in their farm system, he was drafted by the Indians in the 1983rule 5 draft. He made his major league debut on April 15, 1984 against the Baltimore Orioles, facing only two batters and giving up a game tying sacrifice fly and a single.[4] For the season, Waddell went 7–4 with a 3.06 earned run average, 59 strikeouts and six saves in 58 appearances for the Indians, setting a club record for relief appearances by a rookie.
Waddell had shoulder surgery in September 1985 and made only three rehab appearances for Cleveland's triple A affiliate in 1986. He was unsuccessful in a brief 1987 comeback bid, going 0–1 with a 14.29 ERA in six games with the Indians. He signed a minor league contract with the Montreal Expos in 1988, and went 3–2 with a 2.95 ERA splitting the season between their double and triple A affiliates. He split the 1989 season between the Expos' and Milwaukee Brewers' farm system before retiring.
Waddell became a U.S. citizen in 1990. He held several corporate jobs in Texas and Arizona, including Intuit, the software company that developed Quickbooks and Turbo Tax. Waddell died of cancer in 2019.
^via Associated Press, "Baseball career good fit for hurler", The Rock Hill Herald, August 3, 1981. Accessed July 28, 2011. "Former clothing salesman Tom Waddell's new career as a baseball pitcher for the Anderson Braves suits him fine.... The Closter, N.J. native signed as a free agent and is now pitching for the Braves' team in the South Atlantic League."
^Celizic, Mike. "Surgery Spurs Waddell's Relief", The Record, March 28, 1986. Accessed June 14, 2020 via Newspapers.com. "A big purple scar runs down the inside of Tom Waddell's right elbow. A smaller wound decorates the outside of the joint. 'It was kind of a 20,000-pitch maintenance operation,' the onetime star pitcher at Demarest High School said yesterday as his team, the Cleveland Indians, played the Chicago Cubs in a spring training game."