Minor Leagues (1989) Prior to making his major league debut, Sosa played for the
Tulsa Drillers and
Oklahoma City Comets.
Texas Rangers (1989) Sosa made his major league debut on June 16, 1989, with the Texas Rangers, wearing #17 and leading off as the starting
left fielder. He hit his first career
home run off
Roger Clemens.
Chicago White Sox (1989–1991) On July 29, 1989, the Rangers traded Sosa with
Wilson Álvarez and
Scott Fletcher to the Chicago White Sox for
Harold Baines and
Fred Manrique. In 1990, Sosa batted .233 with 15 home runs, 70
runs batted in, 10
triples, and 32 stolen bases. He also struck out 150 times, fourth most in the American League. Sosa started the 1991 season by hitting two home runs and driving in five runs. However, he slumped for the rest of the year and batted .203 with 10 home runs and 33 runs batted in.
Chicago Cubs (1992–2004) The White Sox traded Sosa and
Ken Patterson to the
Chicago Cubs for
outfielder George Bell before the 1992 season. Sosa batted .260 with eight home runs and 25 RBIs in his first season with the Cubs. In 1993, Sosa batted .261 with 33
home runs with 93 RBIs. He also showed his speed by stealing 38 bases and became the Cubs' first 30-30 player. Sosa continued to hit for power and speed in 1994 but he also improved his batting average. He ended up batting .300 with 25 home runs, 70 RBIs, and 22
stolen bases. Sosa was named to his first All-Star team in 1995. In 144 games, he batted .268 with 36 home runs and 119 RBIs. Sosa continued his success with the Cubs in 1996 as he batted .273 with 40 home runs and 100 RBIs. However, in 1997, Sosa batted just .251 with a .300 on-base percentage, and led the league in strikeouts with 174 despite hitting 36 home runs with 119 RBIs. After years as a respected power/speed threat with a rocket arm in right field, he emerged during the 1998 season as one of baseball's greatest. It was in this season that both Sosa and Mark McGwire were involved in the "
home run record chase", when both players' prowess for hitting home runs drew national attention as they attempted to pass
Roger Maris' single season home run mark of 61 home runs. In the early months of the year, Sosa trailed McGwire significantly, being as many as 16 homers behind at one point in May. But as the chase progressed, Sosa eventually tied McGwire with 46 home runs on August 10. However, McGwire pulled away slightly and reached 62 home runs to break the record first on September 8. Sosa tied McGwire once again at 62 on September 13. Eleven days later, with two games left to play in the season, the two were tied at 66 home runs each. Sosa ended the season with 66, finishing behind McGwire's 70. It was during that season that Cubs announcer
Chip Caray nicknamed him "Slammin' Sammy", a nickname that quickly spread. Sammy produced then career-highs in batting average and slugging percentage, at .308 and .647 respectively. Sosa also led the league in
RBIs and runs scored. . Also in 1998, Sosa's 416 total bases were the most in a single season since
Stan Musial's 429 in 1948. Sosa's performance in the month of June, during which Sosa belted 20 home runs, knocked in 47 runs, and posted an .842
slugging percentage, was one of the greatest offensive outbursts in major league history. Sosa won the
National League Most Valuable Player Award for leading the Cubs into the playoffs in 1998, earning every first-place vote except for the two cast by
St. Louis writers, who voted for McGwire. He and McGwire shared
Sports Illustrated's 1998 "
Sportsman of the Year" award, as well as
The Sporting News Sportsman of the Year honor. Sosa was honored with a
ticker-tape parade in his honor in New York City, and he was invited to be a guest at US President
Bill Clinton's 1999
State of the Union Address. 1998 was also the first time the Cubs made the post-season since 1989. The Cubs qualified as the NL Wild Card team, but were swept by the
Atlanta Braves in the
NLDS. In the 1999 season, Sosa hit 63 home runs, again trailing Mark McGwire, who hit 65. In the 2000 season, Sosa led the league by hitting 50 home runs. He received the
Babe Ruth Home Run Award for leading MLB in homers. In 2001, he hit 64 home runs, becoming the first player to hit 60 or more home runs three times. However, he did not lead the league in any of those seasons; in 2001, he finished behind
Barry Bonds, who hit 73 homers, breaking the single-season home run record set by McGwire in 1998 (70). In 2001, he also set personal records in
runs scored (146),
RBI (160),
walks (116),
on-base percentage (.437),
slugging percentage (.737), and
batting average (.328). Major League Baseball confiscated and tested 76 of Sosa's other bats after his ejection; all were found to be clean, with no cork. Five bats he had sent to the Hall of Fame in past years were also tested, and were all clean as well. Sosa stated that he had accidentally used the corked bat, which he claimed he only used during batting practice, and apologized for the incident. When Cubs manager
Dusty Baker was interviewed later, he stated any use of corked bats on his team is strictly prohibited. On June 6, Sosa was suspended for eight games all without pay which was reduced to seven games (again without pay) on June 11 after appeal. Sosa finished the season with 40 home runs and hit two more in the
2003 NLCS against the
Florida Marlins, falling to the team in seven games. In May 2004, Sosa suffered an odd injury while sitting next to his locker chatting with reporters before a game in San Diego's
Petco Park. He sneezed very violently, causing severe back pain. He was diagnosed with back spasms and placed on the disabled list. He finished with 35 homers, far below his numbers of his best years. Despite his declining production and release from the team at the end of the 2004 season, between 1995 and 2004 Sosa clubbed 479 home runs which is the most home runs by a player in history over a 10-year span. He also owns numerous team records for the Cubs and he holds the major-league record for the most home runs hit in a month (20, in June 1998). His tenure came to an end without fanfare, as he did not play in the final game of the regular season (played in Chicago) per his request, with Sosa reportedly leaving
Wrigley Field before the game had ended. Sosa had stated he had permission from Baker to not play, while Baker stated that former assistant trainer Sandy Krum (serving as the go-between for the two) told Baker that Sosa had felt a bit injured and wanted out of the final game, but he expected Sosa to be on the bench with the rest of the players who weren't in the starting lineup.
Baltimore Orioles (2005) On January 28, 2005, the Cubs traded Sosa to the
Baltimore Orioles in exchange for
infielder-outfielder
Jerry Hairston Jr., infielder
Mike Fontenot, and RHP Dave Crouthers. To facilitate the deal, Sosa and his
agent agreed to waive the clause that guaranteed his 2006 salary, and the
players' union indicated it would not object to that agreement. Under the deal, Sosa earned $17.875 million for the 2005 season, with the Cubs paying $7 million of his salary. By playing for the 2005 Orioles alongside fellow 500-home-run batter
Rafael Palmeiro, Sosa and Palmeiro became the first
500 home run club members in history to play together on the same team after reaching the 500 home run plateau. Sosa finished the 2005 season batting .221 with 14 home runs, his worst performance since 1992, and continuing his post-2001 trend of declines in batting average, homers, total bases, and RBI. On December 7, 2005, the Orioles decided not to offer him an arbitration contract, effectively ending his Baltimore Orioles tenure and making him a free agent. In 2005,
The Sporting News published an update of their 1999 book ''Baseball's 100 Greatest Players''. Sosa did not make the original edition, but for the 2005 update, with his career totals considerably higher, he was ranked at Number 95. During a stretch of nine consecutive years, Sosa hit 35 or more home runs and 100+ RBIs, all with the Chicago Cubs. During that year, Sosa accompanied President
Leonel Fernández of the Dominican Republic on several diplomatic trips including to the United States, Japan, and
Taiwan.
Texas Rangers (2007) The Texas Rangers, Sosa's original team, signed him to a minor league deal worth $500,000 on January 30, 2007. This was the same contract that Sosa turned down the previous year from the Nationals. The contract included an invitation to
spring training, where Sosa competed for a spot in the lineup with
Nelson Cruz,
Jason Botts, and other rookies/prospects. Sosa was successful during spring training and was added to the team's 25-man roster. He started the 2007 season as the Rangers' designated hitter and occasional right fielder. At the same time, the Chicago Cubs awarded Sosa's number 21 to new pitcher
Jason Marquis, who coincidentally served up Sosa's 600th career home run. This caused some concern, due to Sosa's accomplishments with the Cubs, including his status as the Cubs' all-time home run leader. On April 26, 2007, Sosa made history by hitting a home run in his 45th major league ballpark. He has also homered in
The Ballpark at Disney's Wide World of Sports, near
Orlando, Florida, a usually minor-league and
Spring training park that hosted a regular season series between the Rangers and the
Tampa Bay Devil Rays in May 2007, although he did not hit a homer at the two regular season games the Cubs played at the Tokyo Dome in 2000 vs. the Mets. On June 20, 2007, Sosa hit a home run off of Jason Marquis during an inter-league game against the Chicago Cubs. Sosa became only the fifth man in history, following
Babe Ruth,
Willie Mays,
Hank Aaron, and
Barry Bonds, to hit 600 regular season home runs. The home run was the first one that Sosa had recorded against the Cubs, and as a result he has hit a home run against every active MLB team. Sosa is the Cubs' all-time home run leader, having hit 545 with that team.
End of career (2008–2009) On May 28, 2008, Sosa announced that he instructed his agent not to offer his services to any MLB team for the 2008 season, and planned on filing for retirement, but never did. On December 25, 2008, Sosa announced he intended to unretire and play in the
World Baseball Classic and once again test the free agent market in hopes of signing with a Major League ballclub in 2009. Sosa said that he had been keeping in shape at his home, and was hoping that after a strong World Baseball Classic he would prove to major-league teams that he was still capable of playing in MLB. However, he was not selected as part of the Dominican Republic's roster. He remained a free agent and did not actively look for a team. On June 3, 2009, Sosa announced his intention to retire from baseball. He made the announcement in the Dominican Republic and said that he was calmly looking forward to his induction into the
Baseball Hall of Fame since his statistics were up to par. ==Drug test controversy==