The Bucks won 123-119 over the Suns on Saturday, claiming an all-important road win, with Game 6 back in Milwaukee, offering them the chance to clinch the NBA title on their home court.
The result is also the third straight loss for the Suns, who seemed dejected post-game, but Williams insisted they still could find a way to win.
“We got to win one game to put them back on the plane. That’s it,” Williams said.
“And you have to have that determination that you’re willing to do whatever it takes to put them back on the plane.
“So, we can call it what we want to, mental toughness, all of that stuff, but it’s going to be needed and our guys are capable of doing it.
“This is our first time in this position and we can do it.”
For the Suns, Devin Booker had 40 point with three assists, while Paul added 21 points and 11 assists.
Antetokounmpo was spectacular with 32 points, nine rebounds and six assists, while Holiday had 27 points and 13 assists, with Khris Middleton scoring 29 points, seven rebounds and five assists.