Serbian qualifier Filip Krajinovic defeated defending champion Fabio Fognini 6-4, 6-0 as a host of seeded players crashed out in the second round of the Hamburg Open on Wednesday.
The 149th-ranked Krajinovic converted five of his 10 break point chances against the second-seeded Italian and dropped just eight points in the second set to win in only 54 minutes.
Krajinovic next plays Serbia's Dusan Lajovic, who defeated 15th-seeded Carlos Berlocq of Argentina 6-3, 6-4.
Fifth-seeded Mikhail Youzhny of Russia lost 7-5, 7-5 to 17-year-old Alexander Zverev, and another German wild card Tobias Kamke defeated 13th-seeded Argentine Federico Delbonis 6-3, 6-4.
Leonardo Mayer of Argentina upset 10th-seeded Spaniard Guillermo Garcia-Lopez 7-6 (1), 7-6 (3).
Czech player Lukas Rosol beat 14th-seeded Joao Sousa of Portugal 6-2, 6-4.