RULE 10 – Change of Ends
The players shall change ends at the end of the first, third and every subsequent odd game of each set. The players shall also change ends at the end of each set unless the total number of games in that set is even, in which case the players change ends at the end of the first game of the next set. During a tie-break game, players shall change ends after every six points.
Additional approved alternative procedures can be found in Appendix IV.