Haas rallied from a set down to defeat the French world number 12 and second seed 4-6 6-3 6-4 in two hours and six minutes on the red clay in Hamburg.
The German won five of his seven break point opportunities and will face countryman Florian Mayer in the quarter-finals.
Mayer swept aside Dutchman Robin Haase 6-2 6-1 in 56 minutes at the ATP 500 event.
The seventh seed capitalised on all but one of his six break point opportunities and converted 90 percent of his first serves in a masterful performance.
Croatian fourth seed Marin Cilic will meet Spaniard Albert Ramos in the last eight after both players won their respective second-round matches.
Cilic accounted for Argentine qualifier Federico Delbonis 6-3 6-2, while Ramos overcame the Czech Republic's Lukas Rosol 7-6 (10-8) 4-6 6-3.
Meanwhile, local third seed Stanislas Wawrinka bowed out to Frenchman Paul-Henri Mathieu in the second round at the Suisse Open.
Wawrinka was eliminated in straight sets at the ATP 250 tournament with a 7-6 (7-3) 7-6 (10-8) loss to the world number 172.
Mathieu saved seven of nine break point opportunities, while Wawrinka was left to rue 10 double faults on the red clay in Gstaad.
Russian fourth seed Mikhail Youzhny was also ousted, losing 4-6 6-2 6-4 to Brazil's Thomaz Bellucci.
Bellucci will face Feliciano Lopez in the quarter-finals after the Spanish fifth seed defeated Czech Jan Hajek 6-7 (3-7) 6-1 6-4.
Lopez converted four of his five break point opportunities before wrapping up proceedings in one hour and 49 minutes.
Latvian Ernets Gulbis accounted for Frenchman Benoit Paire 5-7 7-6 (7-3) 6-4, while in the last opening round match to be played, Colombian seventh seed Santiago Giraldo cruised past local hope Henri Laaksonen 6-2 6-2.
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