Hamburg, Germany (SportsNetwork.com) - Serbian qualifier Filip Krajinovic upset defending champion Fabio Fognini in straight sets Wednesday in the second round of the Bet-at-Home Open.
The 149th-ranked Krajinovic, playing his first event on the ATP World Tour this season, broke the second-seeded Italian's serve five times in the 6-4, 6-0 win, which took just 54 minutes.
Coming off a semifinal run last week at the Mercedes Cup in Stuttgart, Fognini was given a first-round bye and led a mass exodus of seeded players on Wednesday.
German Alexander Zverev, a 17-year-old wild card, reached the third round by knocking off fifth-seeded Russian Mikhail Youzhny 7-5, 7-5. German Dustin Brown fought back to dismiss ninth-seeded Spaniard Fernando Verdasco 4-6, 6-2, 7-6 (10-8).
Argentine Leonardo Mayer defeated 10th-seeded Spaniard Guillermo Garcia-Lopez 7-6 (7-1), 7-6 (7-3), German wild card Tobias Kamke ousted 13th-seeded Argentine Federico Delbonis 6-3, 6-4; Czech Lukas Rosol topped 14th-seeded Joao Sousa of Portugal 6-2, 6-4; and Serbian Dusan Lajovic bested 15th-seeded Argentine Carlos Berlocq 6-3, 6-4.
Delbonis lost to Fognini in last year's Hamburg final.
Fourth-seeded Ukrainian Alexandr Dolgopolov and seventh-seeded German Philipp Kohlschreiber dodged the wave of upsets. Dolgopolov eased past Poland's Jerzy Janowicz 6-4, 6-1, while Kohlschreiber posted a 7-5, 6-1 win over Portuguese qualifier Gastao Elias.
Frenchman Gilles Simon, the No. 12 seed and 2011 Hamburg champion, advanced to the third round when Slovakian Martin Klizan withdrew before their match.
Italian Andreas Seppi, the 16th seed, rallied to beat Argentina's Juan Monaco 1-6, 6-0, 7-6 (7-3). Monaco won the tournament in 2012.
Also, Spaniard Pablo Andujar outlasted Brazilian lucky loser Thomaz Bellucci in three sets.