In addition to the (full sized) court described in Rule 1, the following court dimensions  may be used for 10 and under tennis competition: Only the following ball types, which are specified in Appendix I, can be used in 10 and  under tennis competition: Courts: Balls: Scoring methods: Timed matches: For 10 and under tennis competition using Stage 3 (Red), Stage 2 (Orange) or Stage  1 (Green) balls, scoring methods specified in the Rules of Tennis (including those  specified in Appendix V) can be utilised, in addition to short duration scoring methods  involving matches of one match tie-break, best of 3 tie-breaks/match tie-breaks, one  short set or one regular set. For 10 and under tennis competition the tournament committee may set a specific  time period for matches in the event. Note: Other ball types described in Appendix I cannot be used in 10 and under tennis  competition. •  A court, designated “Orange”, shall be a rectangle, between 58 feet (17.68 m) and  60 feet (18.29 m) long, and between 20 feet (6.10 m) and 27 feet (8.23 m) wide.  The net shall be between 31.5 inches (0.800 m) and 36.0 inches (0.914m) high at  the center. •  A court, designated “Red” for the purposes of 10 and under tennis competition,  shall be a rectangle, between 36 feet (10.97 m) and 42 feet (12.80 m) long, and  between 14 feet (4.27 m) and 20 feet (6.10 m) wide. The net shall be between  31.5 inches (0.800 m) and 33.0 inches (0.838m) high at the center. •  A Stage 3 (Red) ball, which is recommended for play on a “red” court, by players  aged up to 8 years, using a racket up to 23 inches (58.4 cm) long. •  A Stage 2 (Orange) ball, which is recommended for play on an “orange” court, by  players aged 8 to 10 years, using a racket between 23 inches (58.4 cm) and 25  inches (63.5) cm long. •  A Stage 1 (Green) ball, which is recommended for play on a full sized court, by  advanced players aged 9 to 10 years, using a racket between 25 inches (63.5 cm)  and 26 inches (66.0 cm) long. 286 287 10 AND UNDER TENNIS COMPETITION APPENDIX VII X. EXHIBITS X. EXHIBITS APPENDIX VIII NOTE:  All court measurements shall be made to the outside of the lines.   . 