The seventh seed stunned the two-time champion 6-3, 7-5 to make the last four of a Grand Slam for only the second time after the US Open in 2012.
The 28-year-old had a stellar 2015, winning four tournaments, second only to Serena Williams' five, and she said fellow German Graf's words of wisdom had been instrumental.
"Steffi is a champion. She taught me to believe in myself. She was and still is my idol," Kerber said of Graf, who won 22 Grand Slam titles -- an Open-era record that Serena Williams is gunning to match in Melbourne.
"I was able to practice with her for a few days just before Indian Wells last year. But she taught me actually that I'm on a good way and to try to believe in myself.
"I was trying to do it in the last few months.
"I was going out there today with a lot of confidence and trying to believe really in myself and just going for my shots, trying to play good tennis.
"I'm happy about my game, how I'm playing today."
Kerber is the first German into the last four at the Australian Open since Anke Huber in 1998.
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
