Changing ends during a tennis match occurs at specific junctures. Players alternate sides at the end of the first game of each set, and subsequently after every odd game. This ensures neither player consistently benefits from favorable conditions, such as wind or sun glare, for extended periods.
This alteration is crucial for fairness and competitive balance. Uneven court conditions, prevalent in outdoor play, can significantly impact performance. The periodic change equalizes potential advantages or disadvantages. Historically, this procedure has been a fundamental element of the game, contributing to the integrity of the competition.