Haase, who last week kicked off his North
American hardcourt swing by reaching the Toronto quarter-finals,
converted six of seven break point opportunities to get by world
number three Zverev in a match lasting two hours and 25 minutes.
World number 55 Haase improved to a 2-2 career record against
Zverev, including victories in their last two meetings.
"We've played four times now," Haase said. "The first time he
literally kicked my ass... That was the tournament where he
actually came up. And, yeah, since then he's come a long way.
"And now I was there twice physically, mentally and game-wise I
was there. And we have to be a little bit lucky, as well,
against these top guys."
Haase will face Pablo Carreno Busta in the third round after the
Spanish 13th seed beat Bradley Klahn 6-4 6-4.
Zverev's older brother Mischa fell to defending Cincinnati
champion Grigor Dimitrov 7-6(5) 7-5 in a match delayed by rain.
Djokovic, who needs the Cincinnati title to complete his
collection of ATP World Tour Masters 1000 trophies, rallied to
defeat Frenchman Adrian Mannarino 4-6 6-2 6-1.
The 10th-seeded Serb, who has reached the final five times,
suffered stomach problems during the match and was tended to by
a doctor during the second set.
"I didn't have a great night and wasn't feeling that well for
the first set and a half," Djokovic said. "I kind of made it
through, and with the help of the doctor and God, I'm just happy
that I managed to overcome the challenge."
Djokovic returned to wrap up the second set and raced into a 5-0
lead in the decider before serving out the match. Djokovic will
next face fifth seed Dimitrov.
Former champion Marin Cilic of Croatia, competing in Cincinnati
for the first time since lifting the trophy in 2016, beat
Romanian qualifier Marius Copil 6-7(4) 6-4 6-4.
Sixth seed Kevin Anderson overcame Jeremy Chardy 7-6(6) 6-2
while Swiss wildcard Stan Wawrinka knocked out Japan's Kei
Nishikori 6-4 6-4.
Fourth seed Juan Martin Del Potro had his match against South
Korean Chung Hyeon postponed due to rain.
(Reporting by Frank Pingue in Toronto, editing by Ed Osmond and
Sudipto Ganguly)
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