Roger Federer and his wife Mirka have donated 1m Swiss francs "for the most vulnerable families in Switzerland" and have called on others to add their support.
Because of the coronavirus pandemic, Switzerland has imposed a ban on all private and public events and has closed all non-essential businesses until at least 19 April.
Federer says these are challenging times for everyone and nobody should be left behind.
He adds their contribution is just a start.
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