Davydenko advances, Robredo, Karlovic ousted at Qatar Open
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Davydenko had a 91 percent first-serve rate and converted seven of 13 break-point chances to rout German qualifier Benedikt Dorsch 6-3, 6-0.
Robredo was broken twice in the first set and was upset 6-4, 6-4 by Argentina's Agustin Calleri 6-4, 6-4, evening the series between them 4-4.
Karlovich had 16 aces but failed to convert any of four break chances and also was ousted, 7-6 (2), 6-2 by Belgium's Christophe Rochus.
Other seeds fared better. No. 3 Andy Murray of Britain, last year's runner-up, converted 11 of 17 break-point opportunities and beat Olivier Rochus 6-0, 6-2, while eighth-seeded Dmitry Tursunov defeated Spain's Albert Montanes 6-2, 7-5.
It was the third straight year Rochus has failed to advance past the first round of the $1.05 million event.
Copyright 2008 by The Associated Press
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