The global Japanese fashion retailer Uniqlo appointed Novak Djokovic, the world’s top-ranked male professional tennis player, as its global brand ambassador, of late.

The five-year partnership will see Djokovic promoting the brand and its clothing worldwide. The partnership will also include collaboration on future product lines, as well as co-developing the ultimate Uniqlo functional wear.

The brand also confirms that as its first corporate social responsibility activity it will manufacture a custom-designed charity T-shirt to sell at a select number of Uniqlo stores and online. Proceeds from the sale will be donated to the Novak Djokovic Foundation to support children’s programs.