Tennis players rotate around the net every odd game. That is they switch after the 1st game, 3rd game, 5th game, etc. For example, if the score is 1-0 they switch. If the score is 4-3, they switch. If the score is 6-5, they switch. They switch after they've played every off game.
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It depends upon how long the tiebreaker lasts. They switch after every six points are played.
First one to win 7 points wins the tiebreaker, but you have to win by at least 2, so the tiebreaker can actually go on for a long time, and as a result there can be many switches.
There's a minimum of one switch in a tiebreaker though because at least 7 points must be played.
Based on the amount of points played, here is the mathematical breakdown:
12 points or less played: 1 switch
13-18 total points played: 2 switches
19-24 total points played: 3 switches
25-30 total points played: 4 switches
31-36 total points played: 5 switches
This continues on in 6 point increments until somebody wins by 2.
In tennis historys most famous tiebreaker, McEnroe beat Borg 18-16 in the 4th set tiebreaker in Wimbledon.
Using the table above, there were 5 total switches in this historical tiebreaker.
Players have 90 seconds between normal change of ends and 120 seconds between sets.
Players change ends at the end of each game, and when one player has scored 5 points in the deciding game.
Tennis players change ends after every six points during a tie-breaker. Refer to the USTA link, below, for further information.