Andreescu was a qualifier in Melbourne a year ago and lost to Anastasija Sevastova in the second round.
The Australian Open will run from January 20 to February 2.
Canada's Bianca Andreescu has dropped out of the Australian Open tennis tournament because of a lingering left knee injury. He tweeted that it was a very hard decision, because I love playing in Melbourne but I have to see about my ankle and body as well.
Andreescu rapidly established herself as one of biggest stars on tour during a memorable 2019, soaring from number 178 at the start of the year to as high as number four in October.
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Watson scored on a five-yard touchdown run with 0:24 left in the third quarter to cap off a nine-play, 75-yard scoring drive. Williams added two more scores in the third quarter as Kansas City broke the game open on his runs of one and five yards.
With a remarkable breakout year in 2019, winning the last Grand Slam of the season defeating six-time US Open champion Serena Williams in straight sets, the stage was set up for the 19-year-old's performance at the first Grand Slam of the season. "We hope to see you back in Australia soon", the statement added.
Argentinian tennis player Juan Martin del Potro has pulled out of this month's Australian Open as he continues to recover from a knee injury.
He missed three of the four grand slams past year, having looked to be nearing his best again in 2018, when he reached the US Open final, French Open semis and Wimbledon quarters.
In a post on Twitter, she wrote: "Hey guys, just wanted to give you a little update on my knee rehab after I got injured at the WTA finals in Shenzhen".