A standard baseball game consists of nine innings. Each inning is divided into two halves: the top half and the bottom half. In the top half, the visiting team bats while the home team fields; in the bottom half, the roles reverse. Each team gets a chance to bat and play defense in each inning. The game usually lasts nine innings unless extra innings are needed to break a tie.

In some variations:

• High school baseball games typically have seven innings.
• Little League games often have six innings.
• College and minor leagues usually follow the nine-inning standard, but there can be variations depending on the rules or circumstances.

If the score is tied after nine innings, the game continues into extra innings until one team leads at the end of an inning. So, the main standard is nine innings in professional baseball games.