In the other quarterfinal on Friday night Su-Wei Hsieh beat Sara Sorribes Torrro 6-3 6-2 to set up a match against Andreescu on Saturday evening.
"I guess Auckland just brings the best out of me, " Andreescu said. "I don't know what to say right now because Bianca gave me a hard time today". Andreescu broke Williams, then reeled off eleven straight games, showing scant respect for one of the most feared serves in the sport.
It's becoming obvious that Andreescu is far from your typical teenager; not in the way she plays tennis, nor in the way she celebrates success.
"I've dreamed of playing on this stage against top players and now I'm here", Andreescu said. "That I think is the quality of Bianca".
"The first thing I did was close all my social media because I really get overwhelmed by that kind of stuff", said Andreescu, when asked about how she mentally prepared for the Williams challenge on Friday, after the intense high of toppling Wozniacki the night before.
It was the first time Andreescu had faced a top-10 player.
"That was something she worked on a lot in the off-season, to bring that diversity to another level".
She'll face defending champ Julia Goerges of Germany in tomorrow's final.
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Andreescu, 18, is ranked 152nd in the world.
"There's a book on Bianca now".
It was nearly embarrassing how she tore apart one of the greats of the game by playing the same fearless way she did against Wozniacki. Andreescu also moved her off-season training location from Boca Raton to the IMG Academy in Bradenton, Fla., which allowed her to practise against tougher opponents.
"At the end of the day, win or lose, she has captivated the world of tennis and is so deserving of the accolades".
The US$250,000 WTA Tour event is a warmup for the Australian Open.
She came back from a set and a break down to send the American legend out of the tournament, winning even more admirers and adulation in the process.
Despite the distraction of a blustery wind, Bouchard seemed headed for an upset over the tournament second seed when she won the first set.