Madison Keys beat fellow American CoCo Vandeweghe for the second time in eight days with a 6-4, 3-6, 6-3 victory on Monday to reach the second round of the Cincinnati Open.
World number two and top seed Caroline Wozniacki, runner-up at the south coast event last year, cruised into the semi-finals with a 6-4, 6-3 win over Australia's Ashleigh Barty.
Reigning champion and top seed Angelique Kerber was knocked out of the fourth round of the Australian Open on Sunday, losing 6-2, 6-3 to American Coco Vandeweghe on Rod Laver Arena.
World No 55 Haase improved to a 2-2 career record against Zverev, including victories in their last two meetings.
Women's tennis's biggest names still remaining at the US Open take centre stage on Sunday with Grand Slam winners Maria Sharapova, Venus Williams, Garbine Muguruza and Petra Kvitova all appearing on Arthur Ashe Stadium.
Roger Federer slumped to a shock 2-6, 7-6(8), 6-4 loss to German veteran Tommy Haas at the Stuttgart Open on Wednesday in a disappointing comeback after the 18-times grand-slam champion missed the entire claycourt season.
Roger Federer began his latest quest for a 100th ATP title with a battling 6-4, 3-6, 6-1 win over Philipp Kohlschreiber in the first round of the Dubai Duty Free Tennis Championships on Monday.
Images from all the action on Day 3 at the Australian Open in Melbourne on Wednesday
British pair Jamie Murray and Dominic Inglot defeated Canadians Daniel Nestor and Vasek Pospisil in four sets in Ottawa to give Britain a 2-1 lead ahead of Sunday's reverse singles.
Images from all the action on Day 5 of the Australian Open
A summary of sports events and sports persons, who made news on Sunday
Former champion Stan Wawrinka engaged in a war of words with Jo-Wilfried Tsonga before winning the only argument that mattered on Tuesday, storming into the Australian Open semi-finals with a 7-6(2), 6-4, 6-3 win over the Frenchman.
Dustin Brown's audacious attempt to unseat defending Wimbledon champion Andy Murray with a show-boating brand of serve and volley tennis was always likely to end in failure.
No complaints but quarantine differentials were a mistake: Zverev
After six months out of the game, Federer's fairytale return continued under the lights of Rod Laver Arena where he emphatically quashed doubts about his fitness in three hours and 24 minutes of high-octane tennis.
Wozniacki battles past Kerber into Eastbourne final
A hoped-for fight to the finish for the year-end number one ranking at next month's ATP World Tour Finals in London will likely be a coronation for Rafael Nadal, who is virtually guaranteed ending 2017 top of the pile.
Novak Djokovic continued his Wimbledon preparations by beating American Donald Young 6-2, 7-6(9) on Thursday to reach the semi-finals of the Aegon International tournament at Eastbourne.
The 35-year-old's first match back in action last week at the Stuttgart Open was a flop when he suffered a shock loss to German veteran Tommy Haas, ranked 302 at the time, despite leading for a set and a half.
World number one Simona Halep swatted aside American Nicole Gibbs while Maria Sharapova was flawless in her straight sets victory over Romania's Mihaela Buzarnescu in the opening round of the Shenzhen Open on Monday.
Big-serving Canadian Milos Raonic made a strong return to competition on Friday by beating Viktor Troicki 6-3, 7-5 to reach the third round of the Miami Open.
Djokovic has not reached the last eight of a tournament since last year's Wimbledon and has struggled with a long-term elbow injury.
Federer, who skipped the entire clay court season after winning the Australian Open and claiming titles at Indian Wells and Miami this year, will next play defending champion Florian Mayer who beat Frenchman Lucas Pouille in three sets.
A summary of sports events and persons who made news on Friday
PHOTOS from day four of the Wimbledon championships at the All England Lawn Tennis and Croquet Club in London on Saturday
IMAGES from Day 6 at Wimbledon on Saturday.
A summary of Day 2 at Wimbledon on Tuesday.
PHOTOS from day four of the Wimbledon championships at the All England Lawn Tennis and Croquet Club in London on Thursday.
Everton have been handed the dubious distinction of being the 'dirtiest' Premier League team after a study on the all-time cards and fouls by www.dirtyteams.co.uk.
Former world number one Andy Murray withdrew from the Brisbane International with a hip problem on Tuesday, further putting in doubt the Briton's prospects of being fit in time for the Australian Open later this month.
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