Wildcard Kamke knocks out Chela
Russian Youzhny squeezed past Argentine Carlos Berlocq in straight sets 7-5 7-6.
Chela, also from Argentina, was destroyed in the first set 6-1 before the German crowd's favourite Kamke finished the job 6-4 in the second.
Two further seeds went out at the second-round stage: 10th-seeded Alexandr Dolgopolov lost in three sets to Jarkko Nieminen 6-3 1-6 6-4 while 14th seed Guillermo Garcia-Lopez was beaten 7-6 6-2 by Julian Reister.
Fabio Fognini, the 15th seed, was too good for Victor Crivoi, emerging the victor by 6-1 7-5. Marsel Ilhan beat Philipp Petzschner 6-2 4-6 7-6, Juan Monaco triumphed 6-3 7-5 over Simone Bolelli, Philipp Kohlschreiber defeated Andrey Golubev 7-5 6-3 and Pablo Andujar disposed of Julien Benneteau 6-2 6-2.
In the day's other games, Cedrik-Marcel Stebe dumped out Juan Carlos Ferrero 6-3 6-2, Radek Stepanek won 7-5 7-6 against Andreas Beck and Daniel Gimeno-Traver progressed after Marcel Granollers picked up an injury at a set down.