Novak Djokovic played with a metal-like button on his chest at the French Open. Now tennis enthusiasts are speculating about what it is – the star himself is reticent.
"I'm trying to be like Iron Man," he said at the press conference. The Serb defeated Hungarian Marton Fuscovic in straight sets, 7-6(2), 6-0, 6-3 and is through to the third round. There awaits the Spaniard Alejandro Davidovich Fokina.