[caption id="attachment_17563" align="alignnone" width="580"]Novak Djokovic bows out of Rio Olympics. File Pic Novak Djokovic bows out of Rio Olympics. File Pic[/caption] Internet Desk: In a dramatic second day of action on the tennis courts of Rio, world No.1 Novak Djokovic was left in tears after being dumped out of the Olympic Games.

Just hours after Serena and Venus Williams had suffered a shock defeat in the first round of the women's doubles, world No. 1 Djokovic was beaten 7-6 7-6 by Argentina's Juan Martin del Potro.
Del Potro, who had spent 40 minutes stuck in an elevator in the athletes' village earlier Sunday, went up a level as he claimed a hugely impressive victory.
Djokovic's defeat came on a day where the Williams sisters, reigning champions, suffered their first ever defeat at the Games in 16 matches.
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Seeded first at the tournament, the Americans were beaten 6-3 6-4 in 93 minutes.
The sisters, who won the women's doubles title in 2000, 2008 and 2012, were stunned in the first round by the Czech pairing of Lucie Safarova and Barbora Strycova.
This defeat capped a couple of miserable days for older sibling Venus, who was dumped out of thesingles draw in the first round by Belgium's Kirsten Flipkens.
Earlier Sunday, Serena started the defense of her singles title with a 6-4 6-2 win over Australia's Daria Gavrilova.
She will play Alize Cornet in the second round after the French player overcame Sweden's Johanna Larsson.
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Andy and Jamie Murray are out of the Rio 2016 men's doubles after losing 7-6 (8-6) 7-6 (16-14) to Brazilian pair Thomaz Bellucci and Andre Sa.
The Murrays saved six match points, and wasted five set points, in an epic second-set tie-break before Bellucci and Sa eventually completed the win. Earlier, defending champion Andy Murray won his opening singles match,beating Serbia's Viktor Troicki 6-3 6-2. British women's number one Johanna Konta beat Stephanie Vogt 6-3 6-1. The 25-year-old 10th seed had to see off two break points in the first set before taking control against the world number 290 from Liechtenstein.