Garbine Muguruza says she wants to keep working with new coach Sam Sumyk. The world No. 4, who started working with Sumyk in Tokyo, reached the Wuhan final and then won Beijing.

"For sure I'm happy the way we're working," she said. "I think he's a very professional guy. He knows what it takes to be there. This is very important for me, to have somebody who knows what I have to do and what I don't have to do."

Sumyk, who coached Victoria Azarenka during her climb to No. 1, stopped working with the Belarusian following the Australian Open. He then coached Eugenie Bouchard until the two split following Wimbledon.

"I think he's a very professional guy. He knows what it takes to be there. This is very important for me, to have somebody who knows what I have to do and what I don't have to do," Muguruza said.

The two had a trial partnership through Hong Kong, though Muguruza has withdrawn from the tournament due to an ankle injury. She said the two would speak about their agreement and indicated she would like to extend the coaching relationship.

"It's not official, but let's see what happens," she said.

Muguruza is next scheduled to compete at the WTA Finals in Singapore, having qualified for the tournament thanks to her performance in Beijing.