Williams, who is looking for her third title at Roland Garros and 20th career Grand Slam crown, will face Bacsinszky after the Swiss 23rd seed beat unseeded Belgian Alison Van Uytvanck 6-4, 7-5 in the day's other quarter-final tie.
The American had lost the first set in each of her last three matches in Paris but on this occasion she meant business right from the off, breaking immediately to lead 2-0 on the central Court Philippe Chatrier.
Williams then saved another break point against her in the following game with a brilliant cross-court forehand and, with Errani struggling against her opponent's power, she broke again before serving successfully to take the first set in just 27 minutes.
The second set was tighter, going with serve until Williams broke in the seventh game to lead 4-3, and she then went on to clinch victory on her fourth match point in a marathon ninth game as the match concluded in just one hour and five minutes.
"In the last three matches I lost the first set and today I knew I needed to play very well because she is very good here at Roland Garros so it was very important for me," said Williams.
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
