Novak Djokovic
Novak Djokovic recently won the Toronto Masters.Reuters

Novak Djokovic is known to be a humble man both on and off the court. The 12-time Grand Slam tennis champion from Serbia humbled American swimming superstar Michael Phelps at the Rio Games Village ahead of the start of Summer Games. 

This instance proved that a superstar also can get star-struck. Phelps, who has been a champion himself and will be America's flag bearer at the Rio Olympics, was stunned when he met "The Djoker."

Phelps, who has won 22 Olympic medals including 18 golds in the past four Games, even took a photo with Djokovic, who completed the career Grand Slam at the French Open, earlier this year. 

The two superstars even wished each other good luck for the Rio Olympics. It was absolutely evident that Phelps was in awe of the tennis champion, who will vie for a gold at the Rio Games. 

"I was like, 'Yeah, that's Djokovic'. You give each other the nod and the smile, and I was like 'I'm saying hi. I don't care, I'm saying hi to him,'" Phelps was quoted as saying by AFP.

"We ended up talking a little bit about the event schedule and when he was competing and when I was competing and took a photo and wished each other luck and walked away. He's super-nice, super-down to earth. Easy to talk to."

"It was something that was cool. I've watched so many of his matches on TV, he's had a lot of epic ones."

Here is another instance when Djokovic showed how humble he is even when he is inside the court. take a look: