No, they do not HAVE to wear them, but you will find most of them like wearing them, and they are also written into sponsorship contracts that players must wear them, for advertising purposes.
as long as u can see the whole uniform, anything. on cold days if pitchers hit they usually are allowed to wear jackets. pitchers arent allowed to wear a whole lot on the field except there uniform and an undershirt. the undershirt is not allowed to be white as it is the same colour as the ball and can confuse the batter
Im thinking every other game or so?
Yes! The point of playing in a major league game is earning money and playing games.
The biggest difference between the minor and major games is the skill level of the players. Most major league players started in the minor games. Once they are skilled enough they are drafted into the major games.
There have been 255 Major League players that have hit for the Cycle in a game, there were 122 players in the American League that have accomplished the feat and 133 players in the National League that have accomplished the feat howevver the Miami Marlins and the San Diego Padres have not had any players hit for the Cycle.
Many football players chew before a game to reduce stress and calm them down for the upcoming game.
In order for players to be playable players in "MLB 08 The Show," they must have played at least 1 game in the previous Major League Baseball season and they cannot be 1 of the players that are known as "replacement players" meaning players who played during the 1995 season while there was a Baseball strike ongoing, this is because the replacement players are banned from entering into the Players' Association which means they cannot be in any games that are under license with Major League Baseball and the Players' Association.
The players get new uniforms for each game!
Mostly to allow for travel time for players coming from all corners of the country, and also just to give baseball players a short break mid-season.
Going back to 1871, out of 17172 baseball players, 8240 have pitched in at least one game, 48%
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18 on a regular bases if no one gets subed usually about 20