Germany's Dustin Brown has upset top-seeded Marin Cilic 6-4 6-4 at the Open Sud de France in Montpellier.
The 84th-ranked Brown broke his Croatian opponent once in each set to reach the quarter-finals at the indoor tournament.
Brown, who sealed his win with an ace, will next face Frenchman Benoit Paire or fifth-seeded Feliciano Lopez of Spain.
It has been a disappointing start to the year for world No.7 Cilic, who has won just one match and lost in the second round of the Australian Open.
Qualifier Kenny De Schepper, a 162th-ranked Frenchman, created another upset in the southern French city by defeating sixth-seeded Mischa Zverev 6-4 6-3 in a first-round match.
It was De Schepper's first victory on the main circuit since reaching the second round in Montpellier a year ago.
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