Tennis great Djokovic exits US Open in first round amid tears and pain
Novak Djokovic's pursuit of a 25th Grand Slam ends in a five-set defeat to unseeded Argentinian player Mariano Navone.
<p>Novak Djokovic's pursuit of a 25th Grand Slam ends in a five-set defeat to unseeded Argentinian player Mariano Navone.</p>