Former world number one Marat Safin continued his comeback with a straight-sets win over ninth-seed Tomas Berdych in the second round of the Hamburg Masters.

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• Draw and results

There was another upset as American seventh seed James Blake fell to the Serb Janko Tipsarevic 4-6 6-3 6-3 in two.

Safin has plummeted down the rankings to 89th after suffering a series of injuries and had to qualify for the main draw, but hit four aces on his way to knocking out Berdych.

The 28-year-old Russian, who was runner-up here in 2000 and 2002, is now on course to meet another former world number one Carlos Moya in the third round if the Spaniard beats Belgian Oliver Rochus.

Argentine Juan Monaco is also in the third round after the 12th seed breezed past Italy's Simone Bolelli 6-2 6-1.

He will play another Italian in the third round when he faces Andreas Seppi who removed French number one and eighth seed Richard Gasquet on Tuesday.