Draft and minor leagues in 1981 Mattingly lasted in the
1979 Major League Baseball draft until the 19th round, when he was selected by the
New York Yankees. His father, Bill, informed major league teams that his son intended to honor his college commitment and would not sign a professional contract. Don Mattingly was not interested in attending college, so he chose to sign with the Yankees, receiving a $23,000
signing bonus. Mattingly began his professional career in
Minor League Baseball with the
Oneonta Yankees of the
Low-A New York–Penn League in 1979. He hoped to bat .500 for Oneonta and was disappointed with his .349 batting average, which never went lower than .340. He won the league MVP award and was named to the postseason All-Star team. With the
Double-A Nashville Sounds in 1981, he hit .316 and led the
Southern League with 35 doubles. He was selected to play in the
Southern League All-Star Game and named to its postseason All-Star team. Despite Mattingly's hitting ability, concerns existed about his lack of speed and
power.
Bob Schaefer, his manager at Greensboro, said that the organization considered moving him to second base, from which he would throw right-handed.
New York Yankees (1982–1995) Mattingly made his major league debut on September 8, 1982, as a late-inning defensive replacement against the
Baltimore Orioles. He recorded his first at bat on September 11 against the
Milwaukee Brewers,
popping out to third base in the seventh inning. He made his first career major league hit in the bottom of the 11th inning of a 3–2, 12-inning loss to the
Boston Red Sox on October 1, a single to right field off
Steve Crawford. He only had two hits in 12 at-bats that season. Mattingly spent his rookie season of 1983 as a part-time first baseman and outfielder. After four games in April, he was sent back to Columbus for two months before returning, and hit .283 in 279 at-bats. He hit his first home run on June 24 against
John Tudor in a 5–4 road loss to the Red Sox. Mattingly became the Yankees' full-time first baseman in 1984. With a batting average of .339, he was selected as a reserve for the 1984
All-Star Game. Mattingly followed up his breakout season with a spectacular 1985, winning the AL
MVP Award. He batted .324 (third in the league) with 35 home runs (fourth), 48 doubles (first), and 145 RBI (first), then the most RBI in a season by a left-handed major league batter since
Ted Williams drove in 159 in 1949. His 21-RBI margin over second place in that category was the largest in the American League since
Al Rosen's lead of 30 RBI in 1953. He led the league in sacrifice flies (15), total bases (370), and
extra base hits (86), and was second in the AL in hits (211) and slugging percentage (.567), third in
intentional walks (13) and at bats per strikeout (13.9), sixth in runs (107), and ninth in at bats per home run (18.6). He batted .354 with two out and runners in
scoring position. Mattingly was also recognized in 1985 for his defense, winning his first of nine
Gold Glove Awards. including one complete game, and recorded 11 assists with one
error while throwing left-handed. Mattingly had a better year in 1986, leading the league with 238 hits and 53 doubles, and breaking the single-season franchise records set by
Earle Combs (231 hits) and
Lou Gehrig (52 doubles); both records had been set on the
legendary 1927 team. He also recorded 388 total bases and a .573 slugging percentage, and had the league's longest
hitting streak of the season, making hits in 24 consecutive games, from a 3–0 win over the
Seattle Mariners in the second game of a doubleheader on August 30 through a 3–2 loss to the
Detroit Tigers on September 26. He batted .352 (second in the league), hit 31 home runs (sixth) and drove in 113 runs (third). He was beaten in the American League MVP voting, though, by pitcher
Roger Clemens, who also won the
Cy Young Award that year. Mattingly also became the last left-handed player to field a ball at third base during a major league game. In 1987, Mattingly tied
Dale Long's major league record by hitting home runs in eight consecutive games, from July 8–18 (the All-Star game occurred in the middle of the streak; Mattingly, starting at first base, was 0 for 3). This record was later tied again by
Ken Griffey Jr., of the Mariners in 1993. Mattingly also set a record by recording an extra base hit in 10 consecutive games. Mattingly had a record 10 home runs during this streak (Long and Griffey had eight during their streaks), including a 12–3 road win over the
Texas Rangers on July 16 in which he had two home runs including a grand slam and a career-high seven RBI. That year, Mattingly set a major league record by hitting six grand slams in a season (two during his July home run streak), a record matched by
Travis Hafner during the 2006 season. Mattingly's grand slams in 1987 were ironically the only grand slams of his career. In June 1987, Mattingly reportedly injured his back during some clubhouse horseplay with pitcher
Bob Shirley, though both denied this. Nevertheless, he finished with a .327 batting average, 30 home runs, and 115 RBI, his fourth straight year with at least 110 RBIs. Between 1985 and 1987, Mattingly hit 96 home runs with just 114 strikeouts. Unsigned for the 1996 season, Mattingly decided to sit out for the year, and rebuffed an inquiry by the
Baltimore Orioles, which tried to sign him at midseason. Mattingly officially announced his retirement in January 1997. For his career, Mattingly never appeared in the World Series, and his tenure with the Yankees marks the team's longest drought (14 years), later tied (2010–2023) without a World Series appearance. The Yankees made the series in both (the year prior to Mattingly's debut) and their championship season (the year after his last with the club). ==Coaching career==