He says New Zealand's semifinal win on Tuesday was "sport at its finest" and he is confident the team can pull off another historic first victory in tomorrow's night's final.
"It's a pretty big job but they've got the whole country right behind them. Led by 'Captain Fantastic' Brendan McCullum, they're just blossoming. It's just rubbing off on the boys, his brand of cricket."
Williams plans to watch the match with players at his live-in academy, which attracts cricketing talent from around the world.
When Bay of Plenty Times Weekend visited this week, he had 18 players from England, Scotland, the Netherlands and Zimbabwe staying for stints of between three and six months.
They had already watched the semifinal together and all but the Zimbabwe players had given their allegiance to New Zealand over South Africa.
"We were jumping around and falling over when they won," says Williams. "We were tearing down the walls."
Tomorrow, the group is planning a barbecue after training, then everyone will "just shack up and watch the game" on TV.
Among those training at the academy is English player Dan Williams, who has drawn New Zealand in a sweepstake and says the Black Caps' biggest obstacle is likely to be the huge crowd of Australians in the stands at the Melbourne Cricket Ground.
"It will be great to see if New Zealand can stand up to the test," says the 22-year-old, who plays county cricket at home.
Scottish player Mark Watt, 18, who made the 24-man squad for the World Cup but missed out on final selection, believes "New Zealand will come out fighting".
Tomorrow marks the pair's last day at the academy, where Mark says they have learned "a lot of life skills and cricketing skills".
Ben Williams honed his coaching prowess with stints in the United Kingdom and the Netherlands, and his facility is rated world-class. It includes eight grass practice wickets.
As well as nurturing overseas cricketing talent, Williams coaches many young local players, whose eyes are likely to be firmly fixed on the performance of Williamson and Boult.
Aquinas College students Kyle Dovey, 16, and Fergus "Fergie" Lellman, 13, were among those receiving coaching at the academy this week.
They both answered, without a moment's hesitation, when asked to name their favourite Black Cap.
"Kane Williamson," they chimed.
Fergie says Williamson is "the perfect role model".
"He's Tauranga born and bred, and he just lives down the road from us. It's pretty mean."
Kyle says: "He was in our shoes once. When he was our age, he was striving to make the Black Caps. That's our dream too, to play for New Zealand."
The boys say the Black Caps are more than capable of winning the World Cup, and both are excited ahead of the game.
Kyle is to watch it with family and friends at home, while Fergie is lucky enough to be going to Australia with his parents, after his mum shouted them tickets to the match for his dad's 50th.
"It's going to be something, if we win or lose, we're never going to forget," says the 13-year-old.
However, Fergie is hoping his nerves don't get the better of him like they did for the semifinal.
"I couldn't watch the last half of the game. I had to go to bed, I was so nervous. I had to put ear plugs in, in case anything went wrong."
-The game begins at 4.30pm New Zealand time and screens on Sky Sport 3 and Prime.
