Issue link: http://itf.uberflip.com/i/450983
25 HIGH ALTITUDE TENNIS BALLS Brand and Ball name Country of origin Address Code Babolat Gold High Altitude Thailand 4 Dunlop Championship Hard Court High Altitude Philippines 10 Dunlop Fort All Court High Altitude Philippines 10 Dunlop Pro Tour High Altitude Philippines 10 Penn ATP World Tour Extra Duty High Altitude China 16 Penn Championship Extra Duty High Altitude China 16 Pro Penn Marathon Extra Duty High Altitude China 16 Slazenger Wimbledon Ultra Vis High Altitude Philippines 10 Wilson Championship High Altitude Thailand 41 Wilson US Open High Altitude Thailand 41 Note: Pressureless Type 2 and pressurised Type 3 balls are also recommended for play at high altitude. See Rules of Tennis, Appendix I. STAGE 1, 2 AND 3 TENNIS BALLS Brand and Ball Name Country of origin Address code STAGE 1 (Green) Artengo TB 720 Taiwan 3 Artengo TB 720 Thailand 3 Babolat Green Taiwan 4 Balls Unlimited Stage 1 Thailand 5 Bridgestone 1 Taiwan 6 Dunlop Stage 1 Green Philippines 10 Gamma Green Dot China 14 Head T.I.P. Green Thailand 16 HTV Green Thailand 17 Karakal Mid Green Taiwan 21 Mantis Stage 1 Green Thailand 23 Methodik Stage 1 China 37 Nassau Cool Indonesia 25 Penn Control + Thailand 16 Pro's Pro® Stage 1 China 2 RS Green Edition Thailand 31 Slazenger Intro Tennis Philippines 10 Srixon Stage 1 Green Taiwan 11 Tecnifibre Soft Thailand 22 Teloon Mid China 36 Wilson Starter Play Thailand 41 Yonex Muscle Power Ball 40 Taiwan 42 Zsig Green Dot China 43