Rio 2016: Michael Phelps, Juan Martin del Potro and the best pictures from Olympics Day 2

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  Juan Martin del Potro, of Argentina, cries after defeating Novak Djokovic, of Serbia, in the men’s tennis competition. (AP Photo/Vadim Ghirda)

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  Michael Phelps celebrates after winning the gold medal in the men’s 4x100m final. (AP Photo/Martin Meissner)

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  Italy’s Pietro Zucchetti, left, and teammate Ruggero Tita attend a training session of the 49er Men event. (AP Photo/Gregorio Borgia)

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  Canada’s Brittany Rogers competes in the qualifying for the women’s Uneven Bars. (AFP/Ben Stansall)

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  Jonas Valanciunas of Lithuania shoots over Marcus Vinicius Marquinhos of Brazil during a men’s preliminary round basketball game. (Getty Images)

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  Antoine Bouchard of Canada and Masashi Ebinuma of Japan (blue) lay on the mats during the men’s 66kg bronze medal B final.(Photo by Richard Heathcote/Getty Images)

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  Toni-Ann Williams of Jamaica competes in the floor during women’s qualification for Artistic Gymnatics. (Photo by Ian Walton/Getty Images)

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  Qingquan Long of China celebrates during the Men’s 56kg Group A weightlifting contest. (Photo by Lars Baron/Getty Images)

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  Lucien Delfour of Australia a during the Kayak (K1) Men Heats. (Photo by Jamie Squire/Getty Images)