Oct 31 (NDTV): Sania Mirza and Martina Hingis have secured the 2015 WTA Year-End No.1 doubles ranking. The Indo-Swiss pair has won eight titles this year, including Grand Slam crowns at Wimbledon and the US Open.

"Dubai Duty Free congratulates Serena (Williams), Sania and Martina on reaching the No. 1 spot in singles and doubles of the 2015 WTA Year-End ranking," said Salah Tahlak, senior vice-president of Corporate Communications at Dubai Duty Free.

"We are delighted to present the Year-End No.1 trophies to these players which signifies their outstanding results in 2015. We are a proud partner of the WTA and look forward to welcoming Serena, Sania and Martina back to Dubai in February, 2016, to participate in the Dubai Duty Free Tennis Championships," Tahlak added.

Sania and Martina's partnership began at Indian Wells, where they clinched their first title as a team. Their success also saw Sania ascend to the world No.1, becoming the first Indian ever to achieve the numero uno spot in tennis rankings.

Martina is in awe of their "incredible journey".

"It is definitely something beyond my expectations. When I first teamed up with Sania it was a trial at Indian Wells and Miami to see how it would go. We ended up winning both of those tournaments and Charleston on top of it, and since then it has been an incredible journey.

"Ending up as the No. 1 team is definitely something beyond my expectations and something I had dreamed of but when it really happened it was incredible," the Swiss great said.