Sania Mirza and Martina Hingis have decided to part ways.
ESPN learns that Mirza will partner Barbora Strýcová, while Hingis will partner Coco Vandeweghe at the upcoming Cincinati Masters.
Mirza's father Imran Mirza confirmed the split and said the reason was the pair's poor performance in the last few months.
"They were losing to lower ranked players. So the partnership wasn't working," Imran told ESPN.
Mirza and Hingis had a formidable run as doubles partners, which saw them win a total of 14 titles, including a 41-match unbeaten streak in 2015-16. The unbeaten streak included three Grand Slam titles (Wimbledon 2015, US Open 2015, Australian Open 2015).
The pair had a chance to complete a career slam -- or the SanTina slam, by winning the 2016 French Open, but they lost to Barbora Krejčíková and Kateřina Siniaková in the third round. Mirza and Hingis last won a title together in Rome in May; in the four tournaments they played since then, the pair failed to progress beyond the quarterfinals.
Mirza's new partner Strýcová, a 30-year-old from Czech Republic, is a right hander with a strong backhand court game and has won one singles and 18 doubles titles in 13 years on the WTA circuit.
She is currently ranked No. 21 in the singles and No. 39 in doubles. She has also been a part of the Czech Fed Cup team.
She has changed as many as ten doubles partners this year, winning only one title in 2016, at the $780,900 WTA event in Birmingham with compatriot Karolina Pliskova.
Sania will partner with Strýcová for the Cincinnati event, but she is set to play with American Bethanie-Mattek Sands at New Haven before reuniting with the Czech at the US Open, the last Grand Slam of the season.
Sania became world number one in partnership with Martina when they won the Charleston event last year. Last month's Montreal event was their last tournament together, where they lost in the quarterfinals.