Rotterdam, The Netherlands: Top-seeded Nikolay Davydenko cruised into the second round of the ABN Amro tournament on Monday with a 6-3, 6-4 win over Germany's Michael Berrer.After winning the first set in 32 minutes, the third-ranked Davydenko immediately broke Berrer in the second set's opening game.The German left-hander earned a break point in the eighth game of the second set, but Davydenko got back to deuce with an ace, closed out the game and then held serve to complete the set in 42 minutes.In the only other match involving a seeded player on Monday at Rotterdam's Ahoy stadium, Novak Djokovic of Serbia beat French qualifier Florent Serra 7-6 (6), 6-4. The fifth-seeded Djokovic saved a set point in the tiebreaker, and then broke Serra in the ninth game of the second set at Ahoy stadium.The 19-year-old Djokovic is the youngest player in the top 20 of the ATP rankings, but he found it tough against the tenacious Frenchman."It was a struggle," Djokovic said.Djokovic will meet another qualifier, Andrei Pavel of Romania, in the next round. Pavel beat Daniele Bracialli of Italy 6-1, 6-1.In other first-round matches, Belgium's Olivier Rochus rallied to beat Janko Tipsarevic of Serbia 4-6, 6-2, 6-4. Rochus broke Tipsarevic at love in the final game to complete the victory.Dutch wild card Robin Haase recorded his first ever ATP tournament win by beating Croatia's Roko Karanusic 6-4, 7-6 (2).