France's Pierre-Hugue Herbert sprung a minor surprise on the first day of the ATP tournament in Halle on Monday as he beat veteran compatriot Gael Monfils in straight sets.
Herbert, 28, won 7-6 (8/6), 6-4 to inflict a first-round exit on Monfils, who is ranked 27 places above him in the ATP rankings.
There was disappointment for the home crowd as German veteran Philipp Kohlschreiber suffered a second first-round defeat on home soil in the space of a week against American Steve Johnson.
Kohlschreiber, who also lost in the first round in Stuttgart last week, lost 6-3, 6-3 and missed the opportunity to set up a potential second round clash with compatriot Alexander Zverev.
Elsewhere, Moldova's Radu Albot came from behind to win 5-7, 6-1, 6-4 over Australia's Matthew Ebden.
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