Ekaterina Makarova converted on five of six break point opportunities en route to a 60 62 win over fellow Russian Vera Zvonareva, who returned to WTA action earlier this month after an illness and shoulder injury kept her sidelined since the 2012 Olympics.
"I served pretty well and tried to be as aggressive as I could," Makarova said. "I was really focused and maintained a high level the whole match. I'm really happy that I came through.
"She's a great player and a great person. We've spent a lot of time together on the Fed Cup team. I learned from her and want to wish her good luck in her comeback."
Zvonareva was disappointed by the loss but encouraged by her performance this week, which included the first win of her comeback.
"I had too many unforced errors and was not aggressive enough," Zvonareva said. "But overall it went better than the Australian Open. I feel like I'm improving a little bit every day. I wish I could make bigger strides, but I have to keep working hard to be able to play the tennis that I want to play.
"After you haven't competed for a year and a half and have surgery, it's a difficult challenge to come back. Shoulder surgery for a tennis player is quite a dangerous thing. There are a lot of players who weren't able to come back and ever play tennis again, so for me it was a challenge to see what it takes to come back. I have energy and a desire to work, and tennis had given me so much in my life, so I just wanted to give it a try."
Also victorious in second round play was Sorana Cirstea. The third-seeded Romanian converted on all four of her break chances in her 63 64 defeat of Alison Riske to reach her first WTA quarterfinal since Toronto last August.