Top seed Barty crushes Keys to make Australian Open final
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The world number one overwhelmed the 51st-ranked American 6-1, 6-3 in just 62 minutes to set up showdown against either Polish seventh seed Iga Swiatek or American 27th seed Danielle Collins.
She is also looking to add to her 2020 French Open and 2021 Wimbledon 2021 titles, with the top seed on an ominous 10-match win streak to start the year.
"The ball was a little slower tonight, heavier off the strings. I just tried to run and adapt, make as many balls as I could and keep Maddie under the pump on her serve because she has the ability to really take it away from you quickly."
Amazing human being
Barty paid tribute to Keys, a former top-10 player who is on the rise again after difficult couple of years.
"It's just so nice to see her back where she belongs," said Barty. "She's an amazing human being."
Barty has been unassailable in Melbourne, dropping her serve just once through six matches and is yet to drop a set.
And the top seed, who played cricket with her team on Wednesday to relax, was once more in full command of her game with an attacking forehand and lethal backhand slice.
Facing Barty on her home turf was an unenviable assignment for 26-year-old Keys, but she came into the game on a 10-match win streak, the best run of her career.
The Australian, though, immediately pressured her serve to create a break point that she converted with a cross-court winner to assert early control.
She consolidated with a serve to love as Keys struggled to get her racquet on the ball before the American gained confidence with a hold for 1-2.
The American was broken again in the fifth game, as her unforced error count mounted.
She finally won her first points on the Barty serve in the next game and gained a break point when Barty sent a looping forehand long. But the Australian saved it with an ace and stormed 5-1 in front.
Keys' first double fault handed Barty two set points and she slammed a forehand return to take the set in just 26 minutes.
Keys had beaten top 10 players Paula Badosa and Barbora Krejcikova back-to-back to make the last four and was more composed as her nerves settled in set two.
Barty then stepped up a gear in the next game, earning three break points. Keys saved two before a passing shot put her 4-2 clear and there was no way back for the American.