Kate Middleton rocks tennis whites as she takes on Roger Federer for Wimbledon video

Recreation, set, trend match. Kate Middleton seemed sporty in tennis gear yesterday as she joined tennis nice Roger Federer for a YouTube video highlighting the work of Wimbledon’s ball girls and boys. The Princess of Wales, 41, serves as patron of the All England Garden Tennis and Croquet Membership, which hosts the tennis event — and he…