Tyson Fury pulled off the biggest win of his career on Saturday night. The Gypsy King stopped Deontay Wilder by TKO in the seventh round after completely dominating his opponent in Las Vegas. With it, Fury becomes the WBC heavyweight champion and takes his professional record to an incredible 30-0 (with one draw).To post a record like that requires elite mentality - as well as physical ability - and the British boxer has shown time and time again that he has both of those things in abundance.In fact, his elite mentality was on show once again after the fight on Saturday night.

While fielding questions from the public, a spectator attempted to hand Fury a bottle of water. At first, he took it, but then asked Andy Lee where it came from. 

When his coach pointed to the audience, the Gypsy King refused to drink and fans think it was because he feared being spiked ahead of the post-fight drug test. 

Check it out below: 

You can never be too careful and Fury's refusal to drink water from an unknown source after his title fight is very, very smart.

This isn't the first time he's done it, either. Back in 2015, he made a similar decision after his win against Wladimir Klitschko. 

"I had good information from good resources not to touch anything in the changing rooms because they might try and drug you," he said after that fight five years ago, per The Mirror. 

"Someone tried to pass me water, and unless it was sealed and contained from my own baggage, there was no chance.

"I went home dehydrated before I even touched anything. I was so frightened of being drug tested and failing the drugs test. I didn't want to take drinks or food from anyone."

That elite mentality is just part of the reason Fury is on top of the boxing world right now and after beating Wilder, we expect him to stay there for a very, very long time.