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The speeches would not end. Novak Djokovic began to wilt first, dropping his head for a second and then swinging his arms in discomfort. Seconds later, Rafael Nadal let a grimace creep on to his famously stoic face. Then, in a moment that seemed choreographed, both bent forward, palms meeting knees simultaneously. Over the deliberate voice of Tae Hyun (Thomas) Oh, chief operating officer of motor vehicle company Kia Motors Corp., they must have imagined a rumbling sound as lactic acid built up in their muscles, sending waves of pain through their legs and eventually forcing them to sit down.