Riske maintained a high level of intensity. Her head didn’t drop and she got to 3-5 before Ana closed out the set.
A break in the opening game of the second set gave Ana full control of the match.
“We had a tough one in Auckland. I knew that coming into today's match. She had a good run last week, so I really tried to start sharp and tried to play my game to put pressure on her.
"It took a little bit to adjust. The game was very heavy conditions out there today. I was very pleased, especially the way I finished the second set.”
Talking about her season in general, eighth seeded Ana said: "The confidence is on a high level. I had a great season behind me. Still I work hard for each match, and I do that because I love it.
"It's the same. I don't want to take anything for granted. I really enjoy being here. Like in Paris, as well I had a great leadup and quite a disappointing loss. But, it's a new tournament, new situation. I really want to enjoy each match."
Now Ana will play against Karolina Pliskova, who defeated Meusburger 6-2 6-2. They will play this match on thursday