APPENDIX K ITF RULES OF TENNIS f.  If in error a tie-break game is started at 6 games all, when it was previously  agreed that the set would be an “Advantage set”, the error shall be  corrected immediately if only one point has been played. If the error is  discovered after the second point is in play, the set will continue as a “Tie- break set”. g.  If in error a standard game is started at 6 games all, when it was previously  agreed that the set would be a “Tie-break set”, the error shall be corrected  immediately if only one point has been played. If the error is discovered  after the second point is in play, the set will continue as an “Advantage  set” until the score reaches 8 games all (or a higher even number), when  a tie-break game shall be played. h.  If in error an “Advantage set” or “Tie-break set” is started, when it was  previously agreed that the final set would be a match tie-break, the error  shall be corrected immediately if only one point has been played. If the  error is discovered after the second point is in play, the set will continue  either until a player or team wins three games (and therefore the set)  or until the score reaches 2 games all, when a match tie-break shall be  played. However, if the error is discovered after the second point of the  fifth game has started, the set will continue as a “Tie-break set”. (See  Appendix V) i.  If the balls are not changed in the correct sequence, the error shall be  corrected when the player/team who should have served with new balls  is next due to serve a new game. Thereafter the balls shall be changed so  that the number of games between ball changes shall be that originally  agreed. Balls should not be changed during a game. a. Between points, a maximum of twenty-five (25) seconds is allowed.  When the players change ends at the end of a game, a maximum of  ninety (90) seconds are allowed. However, after the first game of each  set and during a tie-break game, play shall be continuous and the players  shall change ends without a rest. 28. ROLE OF COURT OFFICIALS 29. CONTINUOUS PLAY For matches where officials are appointed, their roles and responsibilities can  be found in Appendix VI. As a principle, play should be continuous, from the time the match starts  (when the first service of the match is put in play) until the match finishes. At the end of each set there shall be a set break of a maximum of one  hundred and twenty (120) seconds. 459