Well-known coach Darren Cahill has identified the key to Aryna Sabalenka's success as he shares his thoughts on her becoming World No. 1.

25-year-old Sabalenka achieved a major goal of hers at the US Open earlier this month when she finally usurped Iga Swiatek at the top of the WTA Ranking. The Polish player had been No. 1 for 75 weeks, which is the tenth-longest amount of time in history.

However, after suffering a surprising defeat in the fourth round of the last Grand Slam of the year in New York, Swiatek was unable to defend her ranking points from winning the title at Flushing Meadows last year. Meanwhile, Sabalenka progressed to the final, where she finished as runner-up to Coco Gauff.

The Australian coach revealed his thoughts on the Belarusian player on a recent episode of Jimmy Connors' Advantage Connors podcast.

"While she's had good coaching, the real reason she's been able to step up is she is taking matters into her own hands and she's taken responsibility for everything. She isn't blaming anyone for anything. If she serves a double fault, 'My fault.

"No, I gotta fix that. I've gotta get out on the practice courts and work out why I'm serving these double faults' She works incredibly hard off the court. She pushed herself to be a much better athlete," he said.

Cahill, who coached Andre Agassi in the past and currently works with World No. 7 Jannik Sinner, also revealed that he wasn't sure Sabalenka would ever be consistent enough to become World No. 1 but clearly, she proved him wrong.

"Everyone always knew she's got incredible weapons, and whether or not she was able to harness those weapons and put them into play time and time again to be consistent enough.

I thought she had a much better chance to win a Major than she did at being the No 1 player in the world. Simply because the No. 1 player in the world is tougher. Fewer players are able to do it, 'cause you need to be consistent over a long period of time," he said.