Russia's Nikolay Davydenko upset fourth-seeded Mikhail Youzhny, beating his countryman 7-5, 6-3 to reach the Qatar Open quarterfinals Wednesday.
Once ranked as high as No. 3, Davydenko has struggled in recent years because of injuries. But he looked like his old self in Doha, with a consistent first serve and aggressive play to unnerve the 25th-ranked Youzhny.
Davydenko broke Youzhny to go up 6-5 in the first set, then clinched the set when Youzhny hit a forehand into the net. At 2-2 in the second, Davydenko won three straight games to take control.