BONUS! You're Welcome World: Tennis

It's the game of choice for Serena Williams and Roger Federer ... and the 12th century French monks who invented it. The latest episode of You're Welcome World uncovers the Catholic beginnings of tennis, as well as the way Christians have carried on the tradition of sport.

Do you have the next big idea? Visit to learn about the OSV Innovation Challenge and join the ranks of the Catholic innovators who have gone before us.