Draft and minor leagues After three years at USC and a stint on the
1984 U.S. Olympic team, McGwire was drafted tenth overall in the
1984 Major League Baseball draft by the
Oakland Athletics. In 1984 and 1985, he played for the
Single-A Modesto A's. He began the 1986 season in the minors, with the
Double-A Huntsville Stars and
Triple-A Tacoma Tigers.
Oakland Athletics (1986–1997) McGwire debuted in the major leagues on August 22, 1986. He did not get a hit until his third game, on August 24. In 18 games with Oakland in 1986, he hit three
home runs and had nine
runs batted in (RBIs), but had a lowly .189 batting average.
Rookie home-run record and major-league leader (1987) Retaining his rookie status in 1987, McGwire hit four home runs in the month of April, but followed in May with 15 and another nine in June. Before the All-Star break arrived, he had totaled 33 home runs and earned a spot on the
American League All-Star team. On August 11, he broke
Al Rosen's AL rookie record of 37 home runs. Three days later, McGwire broke the major-league record of 38, which
Frank Robinson and
Wally Berger had jointly held. In September, McGwire hit nine more home runs while posting monthly personal bests of a .351
batting average, .419
on-base percentage (OBP) and 11
doubles (2B). With 49 home runs and two games remaining in the regular season for him to reach 50 home runs, he missed the games in order to attend the birth of his first child. McGwire also totaled 118
runs batted in, a .289 batting average, 97
runs scored, 28 doubles, a .618
slugging percentage and a .370
on-base percentage (OBP). McGwire's 49 home runs as a rookie stood as a major league record until
Aaron Judge hit 52 for the
New York Yankees in 2017. Not only did McGwire lead the AL in home runs in 1987, but he also tied for the major-league lead with
Chicago Cubs right fielder
Andre Dawson. McGwire also led the major leagues in slugging, finished second in the AL in adjusted
on-base plus slugging percentage (OPS+, 164) and total bases (344) and placed third in RBI and on-base plus slugging (OPS, .987). He was unanimously chosen as the AL
Rookie of the Year Award and finished sixth overall in the AL
Most Valuable Player Award voting.
More All-Star appearances (1988–1991) From
1988 to
1990, McGwire followed with 32, 33, and 39 home runs, respectively, becoming the first Major Leaguer to hit 30+ home runs in each of his first four full seasons. On July 3 and 4, 1988, he hit game-winning home runs in the 16th inning of both games. Through , McGwire was tied for third all-time with
Joe DiMaggio in home runs over his first two calendar years in the major leagues (71), behind
Chuck Klein (83) and
Ryan Braun (79). McGwire's most famous home run with the A's was likely his game-winning solo shot in the bottom of the ninth inning of Game 3 of the
1988 World Series against the
Los Angeles Dodgers and former A's
closer Jay Howell. McGwire's game-winner brought the A's their only victory in the 1988 World Series, which they lost in five games; however, McGwire and his fellow
Bash Brother,
José Canseco, played a large part in the 1989 championship club that defeated the
San Francisco Giants in the famous "
Earthquake Series." Working diligently on his defense at first base, McGwire bristled at the notion that he was a one-dimensional player. He was generally regarded as a good fielder in his early years, even winning a
Gold Glove Award in 1990, the only one that the
Yankees'
Don Mattingly would not win between 1985 and 1994. In later years, his mobility decreased along with his defensive ability. His batting averages after his rookie season plummeted to .260, .231, and .235 from 1988 to 1990. In 1991, he bottomed out with a .201 average and 22 homers.
Manager Tony La Russa sat him for the final game of the
season to avoid causing his batting average to dip below .200. Despite the declining averages during this time of his career, McGwire's high
base-on-balls totals allowed him to maintain an acceptable on-base percentage. In fact, when he hit .201, his
OPS+ was 103, just over the league average. McGwire stated in an interview with
Sports Illustrated that 1991 was the "worst year" of his life, with his on-field performance and marriage difficulties, and that he "didn't lift a weight" that entire season. With all that behind him, McGwire rededicated himself to working out harder than ever and received visual therapy from a sports vision specialist.
Career resurgence (1992–1997) The "new look" McGwire hit 42 homers and batted .268 in 1992, with an outstanding OPS+ of 175 (the highest of his career to that point), and put on a victorious home-run-hitting show at the
Home Run Derby during the
1992 All-Star break. His performance propelled the
A's to the American League West Division title in 1992, their fourth in five seasons. The A's lost in the
playoffs to the eventual
World Series champion
Toronto Blue Jays. Foot injuries limited McGwire to a total of 74 games in
1993 and
1994, and just nine home runs in each of the two seasons. He played just 104 games in
1995, but his proportional totals were much improved, as he hit 39 home runs in 317 at-bats. In
1996, McGwire belted a major-league-leading 52 homers in 423 at-bats. He also hit for a career-high .312 average and led the league in both slugging and on-base percentage. McGwire's total of 363 home runs with the Athletics surpassed the previous franchise record. He was selected or voted to nine
American League All-Star teams while playing for the A's, including six consecutive appearances from
1987 through
1992. On April 21, 1997, McGwire became the fourth and final player to hit a home run over the left-field roof of
Detroit's
Tiger Stadium, joining
Harmon Killebrew,
Frank Howard and
Cecil Fielder. The blast was estimated to have traveled 491 feet.
St. Louis Cardinals (1997–2001) On July 31, having already amassed 34 home runs in the
1997 season, McGwire was traded from the
Oakland Athletics to the
St. Louis Cardinals for
T. J. Mathews,
Eric Ludwick and
Blake Stein. Despite playing just two-thirds of the season in the American League, he finished ninth in home runs. In 51 games with the Cardinals to finish the 1997 season, McGwire compiled a .253 batting average, 24 home runs, and 42 RBI. Overall in 1997, McGwire led the majors with 58 home runs. He also finished third in the major leagues in slugging percentage (.646), fourth in OPS (1.039), fifth in OPS+ (170), tenth in RBI (123), and ninth in walks (101). He placed 16th in the NL MVP voting. It was the last year of his contract, so there was speculation that McGwire would play for the Cardinals only for the remainder of the season, then seek a long-term deal, possibly in Southern California, where he still lived; however, McGwire signed a contract to stay in St. Louis. It is also believed that McGwire later encouraged
Jim Edmonds, another Southern California resident who was traded to St. Louis, to forgo free agency and sign a contract with the Cardinals in 2000.
Single-season home run record chase (1998) As the
1998 season progressed, it became clear that McGwire,
Seattle Mariners outfielder
Ken Griffey Jr., and
Chicago Cubs outfielder
Sammy Sosa were all on track to break
Roger Maris's single-season home run record.
The race to break the record first attracted media attention as the home-run leader changed often throughout the season. On August 19, Sosa hit his 48th home run to move ahead of McGwire; however, later that day McGwire hit his 48th and 49th home runs to regain the lead. On September 8, 1998, McGwire hit a pitch by the Cubs'
Steve Trachsel over the left-field wall for his record-breaking 62nd home run, setting off massive celebrations at
Busch Stadium. The fact that the game was against the Cubs meant that Sosa was able to congratulate McGwire personally on his achievement. Members of Maris's family were also present at the game. The ball was given to McGwire in a ceremony on the field by the stadium worker who found it. in a
Chevrolet Corvette after hitting his 62nd home run of the season. McGwire finished the 1998 season with 70 home runs (including five in his last three games), four ahead of Sosa's 66, a record that was broken three seasons later in 2001 by
Barry Bonds with 73. Although McGwire had the prestige of the home-run record, Sammy Sosa (who had fewer home runs but more RBI and stolen bases) won the 1998
NL MVP award, as his contributions helped propel the Cubs to the
playoffs (the
Cardinals finished third in the NL Central). Many credited the Sosa-McGwire home run chase in 1998 with "saving baseball" by attracting new, younger fans and bringing back old fans soured by the
1994–95 Major League Baseball strike.
Later playing career (1999–2001) McGwire kept his high level of offensive production from 1998 going in
1999 while setting or extending several significant records. With 65 home runs, he led MLB for the fourth consecutive season. It was also his fourth consecutive season with at least 50 home runs, extending his own major league record. Sosa, who hit 63 home runs in 1999, again trailed McGwire. Thus, they became the first, and still only, players in major league history to hit 60 or more home runs in consecutive seasons; both players played on teams that finished below .500, which also made them part of dubious history as the first players with 60 home runs for teams with a losing record, a mark that has not been matched since (for all players with 50-HR seasons, McGwire is the only player to have three come on losing teams). McGwire also set a record from 1998 to 1999 for home runs in a two-season period with 135. He also owned the highest four-season home-run total, with 245 from 1996 to 1999. In 1999, he drove in an NL-leading 147 runs while only having 145 hits, becoming the first player with more RBIs than hits in a season. Following the 1999 season, McGwire and the Cardinals exercised a mutual option in his contract for the 2001 season which would pay him $11 million for the 2001 season. Shortly before the 2001 season, McGwire and the Cardinals agreed to another extension through the 2004 season for $30 million which, according to Phil Rogers in the
Chicago Tribune, was far less than he could have made in free agency. However, in 2000 and 2001, McGwire's statistics declined relative to previous years as he struggled to avoid injury, specifically with his knee, which lessened his bat speed. McGwire missed two months of the 2000 season with patella tendinitis while noting his appreciation for coaching. In September, he was used primarily as a pinch-hitter. He played just 89 games and had 32 home runs. In the 2000 postseason, he was used a pinch hitter for six games, where he hit one home run (his fifth and final postseason home run) and walked twice as the Cardinals lost in the NLCS. He had surgery on his right knee to deal with tendinitis immediately the 2000 season ended. McGwire returned to play spring training and Opening Day in April (less than six months since the surgery), but his knee still bothered him, and after he went 2-for-21 (.095), he was moved to the disabled list on April 18. He ended missing a month. He ultimately played just 97 games that year and had 29 of his 56 hits go for home runs while batting .187. His last home run came on September 28 against Pittsburgh. In the
NLDS, McGwire had just one hit in 11 at-bats and was pulled for a pinch-hitter in the 9th inning in decisive Game 5. On November 11, 2001, McGwire announced his retirement, stating, "I am unable to perform at a level equal to the salary the organization would be paying me. I believe I owe it to the Cardinals and the fans of St. Louis to step aside, so a talented free agent can be brought in as the final piece of what I expect can be a world championship-caliber team." ==International career==