World number 58 Bertens often had the extra shot against
Keys, setting up a meeting with Swiss eighth seed Timea
Bacsinszky for a place in the last four.
In a match that should have started on Monday but was delayed
following two days of rain at Roland Garros, Bertens broke to
lead 3-2 in the opening set.
Keys broke back to force a tiebreak but she could not prevent
Bertens, who won the Nuremberg claycourt tournament last month,
from claiming the set after the Dutchwoman produced some
stunning angled winners.
Bertens stole her opponent's serve again in the fourth game of
the second set and held throughout, ending the contest on the
first match point with a backhand passing shot.
Bertens said that although she felt a little sore because of the
heavy balls, she adapted well to the heavy conditions on another
gloomy day.
"It's really different. I think I feel it already a little bit
in my shoulder. The balls are much heavier than the other days,"
she told reporters.
"Also my shots were not like they would have been if the sun was
out but I think still I did a pretty good job today."
(Reporting by Julien Pretot,; Editing by Pritha Sarkar)
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