Am looking for new white tennis balls that used to exist. In a report, Swiss Tennis recommends that amateurs play with different balls after the Covid -19 loosenings. In other words, one player should play only with his own white balls and the opponent only with his own yellow ones, in order to prevent further spreading of the virus (they could also be other colours). One may assume that viruses could be transmitted by touching the balls with the hand (sweat). So far, I have not been able to find an offer of new white or other coloured balls anywhere. Does anyone have a source? I look forward to your feedback. Best regards Alberto

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