Way back in 1992 (ha,ha), the Nike tennis design team created a burning ball logo. The mark was first used on the Nike Air Tech Challenge and was added to the neon colors, denim and spandex of that era's Challenge Court collection. It was said to stand for the game played "fast, furious and unapologetic."
Nike sponsored players at the ATP Finals in London wore them. Federer did his thing in the Zoom Vapor 9 Tour. Nadal would have worn the Courtballistec. The shoes run $130 US each and the Flame tee, $30.
Find them at Nike.com, Tennis-Warehouse and Nike retailers worldwide.