Novak Djokovic, of Serbia, reacts while trailing in a second set tie breaker against Juan Martin del Potro, of Argentina, at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Sunday, Aug. 7, 2016. (AP Photo/Charles Krupa)

Novak Djokovic's first-round Olympic exit has left Serbia in tears, not only the No. 1 tennis player. 
 
Serbia's Prime Minister Aleksandar Vucic offered on Monday a few words of consolation: "Thank you Novak!" 
 
Djokovic shook his head and placed his palm over welling eyes on his way to the locker room after his 7-6 (4), 7-6 (2) setback Sunday night against Juan Martin del Potro of Argentina
 
Vucic says Djokovic's tears "show how much he loves his country ... I thank him for everything he has done for Serbia." 
 
Djokovic can still win a medal for Serbia at the Olympics in Brazil as he plays doubles with Nenad Zimonjic. 
 
Representing Serbia means a lot to Djokovic, who led his country to a Davis Cup title and carried its flag at the opening ceremony of the 2012 Games.
 
(AP file photo/David Goldman)
 
Here's a tweet from Djokovic from early Sunday morning: 

 

 

 
He won bronze at the 2008 Beijing Olympics.