Palm Beach Gardens, Florida
The world No. 2s handled their fairly challenging first-round matches with ease.
Jan 16, 2017
Konta beat Flipkens, Haas retired and Stosur's Australian drought was extended.
Also in action Tuesday are Milos Raonic, Rafael Nadal and Agnieszka Radwanska.
Both are chasing records at Melbourne Park.
Destanee Aiava established the first milestone at the 2017 Australian Open.