The World No.1 team of Martina Hingis and Sania Mirza have split, according to multiple reports. Mirza and Hingis – self-dubbed “Santina” – dominated the doubles tour for over a year, having joined forces for the first time at the 2015 BNP Paribas Open. Together the pair won 13 titles over a 16-month span, including three consecutive majors at 2015 Wimbledon, the 2015 US Open, and 2016 Australian Open, as well as the BNP Paribas WTA Finals Singapore presented by SC Global last fall.

But ever since their 41-match winning streak was snapped in February at the Qatar Total Open by Elena Vesnina and Daria Kasatkina, the team never fully recovered. After their lightening start to 2016, winning their first four tournaments of the year, Hingis and Mirza have won just one title since. As defending champions they lost in the second round at both the BNP Paribas Open and Miami Open this spring and lost back-to-back finals at the Porsche Tennis Grand Prix and Mutua Madrid Open to the No.2 team of Caroline Garcia and Kristina Mladenovic.

After winning their first title in nearly three months at the Internazionali BNL d’Italia, Hingis and Mirza took two surprising straight-set exits at the French Open and Wimbledon. In all, they failed to make it past the quarterfinals of their last four events.

So what does this mean for Hingis and Martina going forward?

Who will they play with now?

According to reports out of India, Hingis will pair with CoCo Vandeweghe and Mirza with Barbora Strycova. Mirza will link up with Strycova at next week’s Western & Southern Open before partnering with Bethanie Mattek-Sands at the Connecticut Open. The plan is to re-team with Strycova at the US Open.

What about the No.1 ranking?

The pairing was a milestone launcher for Mirza. She became the first Indian woman to hold the No.1 ranking after the pair won their third straight title last year at the Volvo Car Open and she won her first major doubles title at Wimbledon a few months later. The two became joint No.1s in January of this year and they will continue to hold the top spot through the US Open unless one of them either reaches the Cincinnati final or wins New Haven.

What does this mean for the WTA Finals in Singapore?

Hingis and Mirza were the first doubles team to qualify for this year’s WTA Finals. Despite their struggles over the last four months they still sit atop the Road to Singapore. Under WTA Rules, Hingis and Mirza can still play as a team in Singapore, but if one of them qualifies with another partner, that player may then choose which team she competes with for the WTA Finals. The player she chooses not to complete with will then be ineligible unless that player has also qualified as part of another team.