Fifth-seeded Sloane Stephens advanced Wednesday at the Australian Open at the expense of her former doubles partner Timea Babos in a second-round match the women's tour billed as a battle of the so-called "frenemies." Stephens, the 2017 U.S. Open champion, dominated 6-3, 6-1 over Babos, who was her partner when the pair won the French, Wimbledon and U.S. Open Junior Grand Slam titles in 2010.