The Indo-Czech duo advanced after fifth seeds Paul Hanley and Kevin Ullyet withdrew while trailing 3-5 in the first set.
Britain's Andy Murray, who lost his Cincinnati Masters quarter-final to American Mardy Fish Friday, was disappointed that tournament organisers had given him three consecutive starts in the midday heat.
Mahesh Bhupathi and Jamie Murray fell to top seeds Mike and Bob Bryan in the second round.
France's Gael Monfils and Gilles Simon suffered early exits from the Cincinnati Masters on Tuesday.
World number one Rafa Nadal battled back to defeat Frenchman Julien Benneteau 5-7, 7-6, 6-2 at the Cincinnati Masters on Thursday and Britain's Andy Murray needed a final set tiebreak to beat Latvia's Ernests Gulbis.
World number one Roger Federer warmed up for the defence of his U.S. Open title in perfect fashion as he beat fourth seed Novak Djokovic 6-1, 7-5 to win the Cincinnati Masters on Sunday.
The Indo-Czech pair were defeated 6-7, 6-7 by second seeds Daniel Nestor and Zimonjic in the quarter-finals of the Cincinnati Masters.
Roger Federer survived a scratchy performance to beat Marcos Baghdatis 7-6, 7-5 to reach the quarter-finals.
World No 1 Rafa Nadal fell to Cyprus's Marco Baghdatis 6-4, 4-6, 6-4 in the quarter-finals of the Cincinnati Masters Friday as three of the top four seeds lost out.
Mahesh Bhupathi and Mark Knowles' six-match winning streak ended with their semi-final loss at the ATP Cincinnati Masters event at the hands of Wimbledon champions Daniel Nestor and Nenad Zimonjic. The fourth-seed Indo-Bahamian pair lost 4-6, 3-6 to the second seeded Canadian-Serbian combination in a little over an hour match of the US$3 million hard court event.
Novak Djokovic beat Rafael Nadal 6-1, 7-5 on Saturday to reach the final of the Cincinnati Masters and bring the Spaniard's 32-match unbeaten streak to a halt. Serb Djokovic will meet Andy Murray in the final after the 21-year-old Briton overcame giant Croatian Ivo Karlovic in the day's other semi-final.
World number 19 Moya battled past Argentine Juan Martin Del Potro 7-5 3-6 7-5 in their third-round match, while Hewitt, ranked 20, eased to a 6-3 6-3 win over Austrian Juergen Melzer.
The world's top four players will face off at the Cincinnati Masters on Saturday as Roger Federer, Andy Murray, Rafa Nadal and Novak Djokovic go head-to-head in two mouth watering semi-finals.
Former world number one Ana Ivanovic showed flashes of the form that took her to the pinnacle of tennis as she upset ninth seed Victoria Azarenka 2-6, 7-6, 6-2 in the first round of the Cincinnati Masters on Monday.
Ashleigh Barty stunningly lost her chance to regain the number one world ranking when the Australian was beaten in straight sets by Russian Svetlana Kuznetsova.
Former world number one Marat Safin was dumped out in the first round of the Cincinnati Masters on Monday, beaten 6-3 7-6 by German Nicolas Kiefer.
Top seed Ash Barty rallied from a set down to power into the semi-finals of the Cincinnati Masters on Friday.
Novak Djokovic overcame a battling Marin Cilic 6-4, 3-6, 6-3 to reach his sixth Cincinnati Masters final on Saturday while Roger Federer enjoyed a less-taxing route to the title match after his semi-final opponent David Goffin retired with a shoulder injury.
World No 55 Haase improved to a 2-2 career record against Zverev, including victories in their last two meetings.
Rohan Bopanna and Edouard Roger-Vasselin knocked out Leander Paes and Radek Stepanek to advance to the semi-finals of the ATP Cincinnati Masters.
Novak Djokovic wore down Lucas Pouille after an even first set, dispatching the Frenchman 7-6(2), 6-1 in a Cincinnati Masters quarter-final in Ohio on Friday.
Iga Swiatek, Aryna Sabalenka and Coco Gauff, are a handful of contenders ready to swoop in
At 27, the second seed is still seeking his first Grand Slam title and hopes to become the first German man to win the Australian Open since Boris Becker in 1996.
Photos pf tennis action across the USA on Sunday.
The five top contenders for the men's title at the US Open.
Nadal, who got a first-round bye, defeated Richard Gasquet 6-3, 6-4 to advance.
Andrey Rublev made the most of Holger Rune's nerves to win a see-saw Monte Carlo final 5-7, 6-2, 7-5 on Sunday, as the Russian's talent was finally rewarded with a Masters title.
Nick Kyrgios has been fined $113,000 by the ATP for arguing with the chair umpire and smashing two rackets during his second-round loss at the Cincinnati Masters.
The 43-year-old Bopanna and 35-year-old Ebden, who claimed two doubles titles on the ATP Tour earlier this year, will next face the unseeded British pair of Jacob Fearnley and Johannus Monday on Sunday.
The seventh-seeded Bulgarian advanced to his eighth ATP World Tour Masters 1000 quarter-final with a 6-3, 7-5 victory over Del Potro, who struggled with the intense heat in the closing stages of the one hour, 39 minute match.
A double fault earned the Russian his eighth ATP title after two hours and seven minutes.
Images from the US Open men's singles first round matches, at Flushing Meadows, New York, on Tuesday.
Frances Tiafoe sees huge strides for American men after another deep US Open run. The ebullient fan favourite was already looking to the future.
While her career has featured a number of highs -- she has won two doubles Grand Slam titles and 11 WTA titles, including the Cincinnati Masters -- Garcia said she has become fixated on what she sees as her failures.
Medvedev suffered a jarring early exit from the Canadian Masters last week but overcame some initial problems in a tricky tie against Shapovalov to edge both sets and book a meeting with American Fritz.
Frances Tiafoe launched into a foul-mouthed tirade directed at a chair umpire after the American received a time violation and then lost to Roman Safiullin in the third round of the Shanghai Masters on Tuesday.
Roger Federer survived an opening-match fright by outlasting Canada's Vasek Pospisil 7-6 (4), 5-7, 6-2 on Wednesday to claim his 300th Masters Series win and reach the third round of the Western and Southern Open in Cincinnati.
In his pre-tournament news conference in Toronto on Sunday, Nadal said a recurring foot issue he has been dealing with since 2005 returned at the French Open, where he fell to eventual champion Djokovic in the semi-finals.
Inspired Garcia goes from Cincinnati qualifier to champion
Rohan Bopanna and Aisam-ul Haq Qureshi avenged their defeat in the Cincinnati Masters, stunning fourth seeds Mariusz Fyrstenberg and Martin Matkowski of Poland in the first round of the Pilot Pen tennis tournament in New Haven on Wednesday. The unseeded Indo-Pak pair scored a 6-3, 2-6, 10-5 win to secure a quarter-final berth in the US $663,750 hard court event.