Tennis great Novak Djokovic has become a part-owner of French Ligue 2 club Le Mans FC with former Formula 1 drivers Felipe Massa and Kevin Magnussen also acquiring stakes, the newly promoted club announced on Friday. The investment is led by Brazilian group OutField, an international consortium co-founded by Pedro Olivera, and includes Georgios Frangulis, CEO of global health-food brand OakBerry. "Djokovic, the most successful player in history, whose mental strength and unique approach will