He began his baseball career in with the
Monroe Monarchs, a minor Negro league team in the Negro Southern League. In , he signed with the Kansas City Monarchs, for which he would play in six out of the next eight years. A rookie season of 56 games played with a .379 batting average, ten home runs, 81 hits, and 60 RBI (for which he led the latter three categories) proved to be the beginning of a career full of raw power. During his pre-war baseball years, he established himself as having the most raw power in Negro league history, and possibly in the history of baseball. He hit
home runs more often than the better known
Josh Gibson, causing Gibson to give Brown his nickname. He also hit for a
batting average of .374 in and regularly hitting over .350. Brown was one of the fastest players in baseball in the late 1930s and 1940s, as well as a solid outfielder. From 1937 to 1946, Brown helped lead the Monarchs to six pennants in ten seasons. He finished second in batting average three times during this period (1937, 1939, 1943). Brown left the Monarchs for the first time in 1940, swayed by the
Mexican Leagues (as devised by
Jorge Pasquel), who raided 63 players with the promise of more money ($1,000 per month); Brown played in Nuevo Laredo. In the 1942 season, the Monarchs met the
Negro National League champion
Homestead Grays in the
1942 Negro World Series, the first Negro World Series between the Negro American League and the Negro National League since 1927. Brown stole a base in Game 2 and hit a home run in Game 3 while collecting seven hits in sixteen combined at-bats in four official games (an exhibition game and a game later not counted by the league was also played). In the winter of 1941-42, he moved to the Puerto Rican leagues in Humacao. He also played parts of 1943-44 in the California Winter League. He served in the U.S. Army in 1944, seeing service in Europe before returning to the Monarchs in 1946 after being released from duty as a
technician fifth grade. Brown entered the baseball record books again on August 13, 1947, when he became the first African-American player to hit a home run in the
American League: an
inside-the-park homer off
Detroit Tigers pitcher and future Hall of Famer
Hal Newhouser. Brown's time in the MLB would be unfortunately brief - after two years spent enlisted in the U.S. Army during WWII, he wasn't able to match the physical prowess he had previously shown in the
Negro Leagues and in Mexico and Puerto Rico during the winter off-seasons. But the biggest obstacle was racism - St. Louis was the southernmost team in Major League Baseball at the time and Brown and Thompson faced much more discrimination and hostility from their own teammates than
Jackie Robinson or
Larry Doby did from their teammates on the
Brooklyn Dodgers and
Cleveland Indians, respectively. Throughout the season Brown struggled from
racism in his new surroundings, hitting .179 in just 21 games between July 19 and August 21 before he was released.
Later career That winter, Brown went to
Puerto Rico and had one of his greatest seasons ever, batting .432 with 27 home runs and 86
RBI in just 60 games, winning the
Triple Crown and earning the nickname
Ese Hombre or "That Man". He then won the Puerto Rican Winter League Triple Crown in the 1949–1950 season, and also
hit for the cycle once in his career. He returned to the Monarchs for the 1948 season (the last before the Negro leagues started to decline in terms of player quality). He played in 44 games and batted .404 while having 67 hits and 53 RBI, with the latter two topping the league totals once again (he finished second in batting average for the fourth and final time). His career home run total is not known, but he is considered to be among the Negro league career leaders in homers despite a relatively brief career. He continued to play for a time with the Monarchs until the early 1950s while also still playing winter ball in Puerto Rico, where he won another Triple Crown in the winter of 1949-50. He played in Canada with the
Border League for the
Ottawa Nationals for a 30-game pennant run. He also played in the
Caribbean Series in
Venezuela along with summer ball in the
Dominican Republic (1951–52). He then played in the
Texas League and
Western League from through . He finished his Puerto Rico play in 1956-57; he batted .350 in his career there and was named to the Puerto Rican Baseball Hall of Fame in 1991. He played in 1957 for the Minot Mallards of the Manitoba-Dakota League before closing out his career barnstorming with the Monarchs in 1958. He then retired to his home in Houston. == Later life and legacy ==