Australian John Millman's German Tennis Championships campaign is over after a straight-sets defeat to top seed Dominic Thiem.
The world No.8 Austrian sprinted out of the blocks in glorious Hamburg sunshine, breaking Millman's serve twice before serving out the opening set in 33 minutes.
The 24-year-old French Open finalist carried that momentum throughout the second set and converted a further two break points on his way to a comfortable 6-2 6-2 victory over the world No.50.
Thiem extended his match win-loss record to 38-11 for the season, which includes two clay court titles in Buenos Aires and Lyon.
He will next face Czech Nicolas Jarry for a place in the semi-finals after the Chilean was handed a walkover by Richard Gasquet.
Pablo Carreno Busta was leading 6-2 4-0 when his opponent Aljaz Bedene was forced to retire due to a hip injury.
Up next for the Spanish third seed is Georgia's Nikoloz Basilashvili, who roared back from 6-1 down in the first set tiebreaker to beat 2013 finalist Pablo Cuevas 7-6 (8-6) 6-4.
