Marichal is also remembered for a notorious incident that occurred with John Roseboro during a game between the Giants and Los Angeles Dodgers at Candlestick Park on August 22, 1965.
The Giants-Dodgers rivalry was, at the time, the fiercest in baseball—a rivalry which began when both teams played in New York City.
As the 1965 season neared its climax, the Giants were involved in a tight pennant race, entering the game trailing the Dodgers by a game and a half while the Milwaukee Braves were one game behind the Dodgers.
During the second game of the series the day before, a Dodger hitter went to first base after an umpire ruled that Giants catcher Tom Haller interfered with his swing; Haller claimed the Dodgers were holding their bats farther back than usual, and Matty Alou responded by doing the same, receiving a warning from Roseboro after his bat actually made contact with the Dodger catcher.

Maury Wills led off the game with a bunt single off Marichal and scored when Ron Fairly hit a double.
Marichal, a fierce competitor, viewed the bunt as a cheap way to get on base and took umbrage with Wills.
When Wills came up to bat in the second inning, Marichal threw a pitch directly at Wills, sending him sprawling to the ground.
Willie Mays then led off the bottom of the second inning for the Giants and Dodgers' pitcher Sandy Koufax threw a pitch over Mays' head as a token form of retaliation.
In the top of the third inning with two outs, Marichal threw a fastball that came close to hitting Fairly, prompting him to dive to the ground.
Marichal's act angered the Dodgers and home plate umpire Shag Crawford warned both teams any further retaliations would not be tolerated.

Marichal came to bat in the third inning expecting Koufax to throw at him.
Instead, Marichal was startled when, after the second pitch, Roseboro's return throw to Koufax either brushed his ear or came close enough for Marichal to feel the breeze off the ball.
Marichal screamed "Why did you do that?"
to Roseboro, who came out of his crouch with his fists clenched.
Marichal later said he thought Roseboro was about to attack him.
Giants captain Willie Mays said Roseboro "brushed [Marichal].
Maybe it was a swing."
Marichal raised his bat, striking Roseboro at least twice on the head, opening a two-inch gash that sent blood flowing down the catcher's face.
Roseboro later required 14 stitches.
Koufax raced in from the mound to attempt to separate them and was joined by the umpires, players and coaches from both teams.

A 14-minute brawl ensued on the field before Koufax, Mays and other peacemakers restored order.
Marichal was ejected from the game and afterwards, National League president Warren Giles suspended him for eight games (two starts), fined him a then-NL record US$1,750 (equivalent to $14,200 in 2019), and also forbade him from traveling to Dodger Stadium for the final, crucial two-game series of the season.
Roseboro filed a $110,000 damage suit against Marichal one week after the incident, but eventually settled out of court for $7,500.

Many people thought Marichal's punishment was too lenient, since it would cost Marichal only two starts.
The Giants were in a tight pennant race with the Dodgers (as well as the Pirates, Reds, and Braves) and the race was decided with only two games to play.
The Giants, who ended up winning the August 22 game and were down only a half-game afterward, eventually lost the pennant to the Dodgers by two games.
Ironically, the Giants went on a 14-game win streak that started during Marichal's absence and by then it was a two-team race as the Pirates, Reds, and Braves fell further behind.
But then the Dodgers won 15 of their final 16 games (after Marichal had returned) to win the pennant.
Marichal won in his first game back, 2–1 vs. the Astros on September 9 (the same day Koufax pitched his perfect game vs. the Cubs), but lost his last three decisions as the Giants slumped in the season's final week. "
Marichal's actions might have cost us the pennant," Mays speculated, noting that the relief pitchers had to work more in the absenc
Marichal is also remembered for a notorious incident that occurred with John Roseboro during a game between the Giants and Los Angeles Dodgers at Candlestick Park on August 22, 1965. The Giants-Dodgers rivalry was, at the time, the fiercest in baseball—a rivalry which began when both teams played in New York City. As the 1965 season neared its climax, the Giants were involved in a tight pennant race, entering the game trailing the Dodgers by a game and a half while the Milwaukee Braves were one game behind the Dodgers. During the second game of the series the day before, a Dodger hitter went to first base after an umpire ruled that Giants catcher Tom Haller interfered with his swing; Haller claimed the Dodgers were holding their bats farther back than usual, and Matty Alou responded by doing the same, receiving a warning from Roseboro after his bat actually made contact with the Dodger catcher.
Maury Wills led off the game with a bunt single off Marichal and scored when Ron Fairly hit a double. Marichal, a fierce competitor, viewed the bunt as a cheap way to get on base and took umbrage with Wills. When Wills came up to bat in the second inning, Marichal threw a pitch directly at Wills, sending him sprawling to the ground. Willie Mays then led off the bottom of the second inning for the Giants and Dodgers' pitcher Sandy Koufax threw a pitch over Mays' head as a token form of retaliation. In the top of the third inning with two outs, Marichal threw a fastball that came close to hitting Fairly, prompting him to dive to the ground. Marichal's act angered the Dodgers and home plate umpire Shag Crawford warned both teams any further retaliations would not be tolerated.
Marichal came to bat in the third inning expecting Koufax to throw at him. Instead, Marichal was startled when, after the second pitch, Roseboro's return throw to Koufax either brushed his ear or came close enough for Marichal to feel the breeze off the ball. Marichal screamed "Why did you do that?" to Roseboro, who came out of his crouch with his fists clenched. Marichal later said he thought Roseboro was about to attack him. Giants captain Willie Mays said Roseboro "brushed [Marichal]. Maybe it was a swing." Marichal raised his bat, striking Roseboro at least twice on the head, opening a two-inch gash that sent blood flowing down the catcher's face. Roseboro later required 14 stitches. Koufax raced in from the mound to attempt to separate them and was joined by the umpires, players and coaches from both teams.
A 14-minute brawl ensued on the field before Koufax, Mays and other peacemakers restored order. Marichal was ejected from the game and afterwards, National League president Warren Giles suspended him for eight games (two starts), fined him a then-NL record US$1,750 (equivalent to $14,200 in 2019), and also forbade him from traveling to Dodger Stadium for the final, crucial two-game series of the season. Roseboro filed a $110,000 damage suit against Marichal one week after the incident, but eventually settled out of court for $7,500.
Many people thought Marichal's punishment was too lenient, since it would cost Marichal only two starts. The Giants were in a tight pennant race with the Dodgers (as well as the Pirates, Reds, and Braves) and the race was decided with only two games to play. The Giants, who ended up winning the August 22 game and were down only a half-game afterward, eventually lost the pennant to the Dodgers by two games. Ironically, the Giants went on a 14-game win streak that started during Marichal's absence and by then it was a two-team race as the Pirates, Reds, and Braves fell further behind. But then the Dodgers won 15 of their final 16 games (after Marichal had returned) to win the pennant. Marichal won in his first game back, 2–1 vs. the Astros on September 9 (the same day Koufax pitched his perfect game vs. the Cubs), but lost his last three decisions as the Giants slumped in the season's final week. "Marichal's actions might have cost us the pennant," Mays speculated, noting that the relief pitchers had to work more in the absenc
Juan Marichal