Mathewson was an important figure in the development of the modern game of baseball. He was among the first to begin throwing a curveball, a pitch that was previously thought to be illegal. He also developed an effective change-up, surprising batters with a slower pitch. Mathewson was also a master of control, often pitching complete games and never walking more than four batters in a single game. He was a very versatile pitcher, able to pitch in any situation, and was a key part of the "Murderers' Row" of the Giants' pitching staff.
Mathewson was a very popular figure in the early days of baseball, with fans coming to the park just to watch him pitch. He was known for his gentlemanly behavior both on and off the field, and was seen as a role model for children. He was also an outspoken promoter of the game, and wrote several books about the sport.
Mathewson was inducted into the Baseball Hall of Fame in 1936. He will always be remembered as one of the best pitchers of all time, and for his outstanding contributions to the game of baseball.
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