No image escapes the camera lenses on a tennis court anymore, but there are still techniques to annoy broadcasters. Gilles Cervera, Daniil Medvedev’s coach, had his own at the Madrid tournament. While he was in his box and to avoid being spied on, the Frenchman simply put a sticker on the small camera in front of him. The technician will not need to slip any other stickers into his pocket in Spain because his protégé was eliminated on Monday by Karen Khachanov.