The doubles team of Barbora Krejcikova and Katerina Siniakova capped off a dominant year on the WTA Tour, winning the Akron WTA Finals in straight sets.

The duo defeated No. 3 seeds Hsieh Su-wei and Elise Mertens, 6-3, 6-4, to claim their first WTA Finals doubles championship. As a result, Siniakova will take over the World No. 1 ranking in doubles, unseating Hsieh.

“This week was really good for us,” Siniakova said in the post-match press conference. “I think we needed to stay aggressive, and we did it. We were really playing well. We keep the team spirit, so we were just trying, we fight. I’m just really happy that we have the trophy.”

It’s the Czech duo’s fifth title of the season, which included their third career Grand Slam women’s doubles title at Roland Garros, the title in Madrid and Olympic gold.