Mark David McGwire (born October 1, 1963), nicknamed Big Mac, is an American former professional baseball player and currently a bench coach in Major League Baseball (MLB).
 As a first baseman, his MLB career spanned from 1986 to 2001 while playing for the Oakland Athletics and the St. Louis Cardinals.
 He quickly grabbed media attention in 1987 as a rookie with the Athletics by hitting 33 home runs before the All-Star break, and would lead the major leagues in home runs that year with 49, setting the single-season rookie record.
 He appeared in six straight All-Star Games from 1987 to 1992 despite a brief career decline related to injuries.
 Another string of six consecutive All-Star appearances followed from 1995 to 2001.
 Each season from 1996 to 1999, he again led the major leagues in home runs.
The 1961 Chicago White Sox season was the team's 61st season in the major leagues, and its 62nd season overall.
 They finished with a record 86–76, good enough for fourth place in the American League, 23 games behind the first-place New York Yankees.
 Their pitching staff surrendered 13 of Roger Maris's 61 home runs that year, the most of any team.
Roger Eugene Maris (September 10, 1934 – December 14, 1985) was an American professional baseball player who played four seasons in the minor leagues and twelve seasons in the major leagues.
 Maris played right field on four Major League Baseball (MLB) teams, from 1957 through 1968.
John "Pretzel" Pezzullo (December 10, 1910 – May 16, 1990), also known as Pretzels Pezullo, was a professional baseball player whose career spanned eight seasons, two of which were spent with the Major League Baseball (MLB) Philadelphia Phillies.
 Pezzullo, a pitcher, compiled an earned run average (ERA) of 6.36, allowing 61 earned runs off of 116 hits, five home runs, and 51 walks while recording 24 strikeouts over 86.1 innings pitched.
 Pezzullo also played in six seasons of minor league baseball.
 He made his MLB debut at the age of 24 after spending a season in the minor leagues for the New York Giants organization.
 Pezzullo earned the nicknamed "Pretzel" after his unusual pitching style.
 After retiring from baseball, Pezzullo moved to Dallas, Texas, where he died of cancer on May 16, 1990.
Walter Edward "Jiggs" Parrott (July 14, 1871April 14, 1898) was a professional baseball player whose career spanned eight seasons, four of which were spent with the Major League Baseball (MLB) Chicago Colts (1892–95).
 Parrott, an infielder, compiled a career batting average of .235 with 174 runs scored, 309 hits, 35 doubles, 23 triples, six home runs and 152 runs batted in (RBIs) in 317 games played.
 Although the majority of his career was spent in the major leagues, Parrott also played in minor league baseball.
 He got his start playing amateur baseball with the East Portland Willamettes.
 His professional baseball debut came in 1890 as a member of the Portland Webfeet.
 Parrott was the first MLB player from Oregon.
 He stood at 5 ft and weighed 160 lb .
 His brother, Tom Parrott, was also an MLB player and a teammate of his on the Chicago Colts.
The 1998 Major League Baseball home run chase in Major League Baseball was the race between first baseman Mark McGwire of the St. Louis Cardinals and right fielder Sammy Sosa of the Chicago Cubs that resulted in both players breaking Roger Maris's long-standing and highly coveted record of 61 home runs.
 McGwire broke Maris's record on September 8 against the Cubs and finished with 70 home runs.
 Sosa finished with 66.
The 1994 San Francisco Giants season was the Giants' 112th season in Major League Baseball, their 37th season in San Francisco since their move from New York following the 1957 season, and their 35th at Candlestick Park.
 After winning 103 games in 1993, the Giants record dropped to 55-60 in a strike-shortened season.
 This was also the season in which Matt Williams hit a career high 43 home runs through 115 games by the time the strike hit, on pace to finish with 61; had the season continued, Williams may have had a chance to break Roger Maris's then-single season record of 61 home runs set in 1961.
August Joseph "Gus" Williams, Jr. (May 7, 1888 – April 16, 1964), known also as "Gloomy" Gus Williams, was a German American professional baseball player whose career spanned 10 seasons, five of which were spent in Major League Baseball (MLB) with the St. Louis Browns (1911–15).
 Over his major league career, Williams batted .263 with 171 runs scored, 367 hits, 58 doubles, 31 triples, 12 home runs, 147 runs batted in (RBIs), and 95 stolen bases in 410 games played.
 Williams career started out in 1909 with the Monmouth Browns of the Class-D Illinois–Missouri League.
 After playing in the minor leagues for two seasons, Williams made his major league debut in 1911.
 He had another stint in the majors in 1912.
 In 1913, Williams served as the Browns regular outfielder.
 He was a dead-ball era power hitter for the Browns, ranking in the top-10 amongst American League hitters in home runs during the 1913 and 1914 seasons.
 He led the league in strikeouts in 1914.
 Williams would make his last appearance in the major leagues during the 1915 season.
 He would go on to play in the minors with the Toronto Maple Leafs (1915), Nashville Volunteers (1916), Louisville Colonels (1917), and Indianapolis Indians (1918).
 In the minors, he compiled a career batting average of .293 with 838 hits in 759 games played.
 Williams also played semi-professional baseball after leaving the professional circuit.
 He batted and threw left-handed.
 During his baseball career, Williams stood at 6 ft and weighed 185 lb .
Mark Charles Teixeira ( ; born April 11, 1980) is an American former professional baseball first baseman.
 He played 14 seasons in Major League Baseball (MLB) for the Texas Rangers, Atlanta Braves, Los Angeles Angels of Anaheim and New York Yankees.
 Before his professional career, he played college baseball at Georgia Tech, where in 2001 he won the Dick Howser Trophy as the national collegiate baseball player of the year.
 One of the most prolific switch hitters in MLB history, Teixeira was an integral part of the Yankees' 27th World Series championship in 2009, leading the American League (AL) in home runs and runs batted in (RBI) while finishing second in the Most Valuable Player Award (MVP) balloting.
 Teixeira was a three-time All-Star, won five Gold Glove Awards and three Silver Slugger Awards, and also holds the all-time major league record for most games with a home run from both sides of the plate, with 14.
 He was the fifth switch hitter in MLB history to reach 400 home runs.
George Herman "Babe" Ruth Jr. (February 6, 1895 – August 16, 1948) was an American professional baseball player whose career in Major League Baseball (MLB) spanned 22 seasons, from 1914 through 1935.
 Nicknamed "The Bambino" and "The Sultan of Swat", he began his MLB career as a stellar left-handed pitcher for the Boston Red Sox, but achieved his greatest fame as a slugging outfielder for the New York Yankees.
 Ruth established many MLB batting (and some pitching) records, including career home runs (714), runs batted in (RBIs) (2,213), bases on balls (2,062), slugging percentage (.690), and on-base plus slugging (OPS) (1.164); the latter two still stand today.
 Ruth is regarded as one of the greatest sports heroes in American culture and is considered by many to be the greatest baseball player of all time.
 In 1936 , Ruth was elected into the Baseball Hall of Fame as one of its "first five" inaugural members.

Question:  How many MLB teams did the baseball player who had 61 home runs in 1961 play for?
Answer: four