ATP Stockholm Open: Tomas Berdych wins comfortably but other seeds tumble

Top-seed Tomas Berdych began his bid for glory at the Stockholm Open with a 7-5 6-3 victory over Germany's Dustin Brown in the second round.

The Czech, fresh off final appearances in both Beijing and Shanghai recently, saved all three break points he faced on his own serve as he came through in straight sets after one hour and 23 minutes on court.

Next up for the 2012 champion in Sweden will be Marius Copil of Romania, who beat fellow qualifier Pierre-Hugues Herbert of France 6-4 6-3.

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Berdych will be looking to pick up crucial ranking points this week as he bids to qualify for the World Tour Finals - he must reach the final to add to his current points tally for the season.

"It's important for me to focus on myself, play good tennis and hit a clean ball," he told the ATP Tour's official website. "I want to have [my qualification] in my hands and decide it for myself."

Berdych, who was given a bye in the first round this week, is currently seventh in the race to get one of the eight berths available for the season-ending event in London.

In other action on Thursday in Stockholm, American Jack Sock caused an upset by knocking out sixth-seeded Jeremy Chardy of France 7-6 (7-3) 6-3. His reward is a clash with defending champion Grigor Dimitrov in the quarter-finals.

Qualifier Matthias Bachinger of Germany also sprung a surprise, smashing down 15 aces as he knocked out fifth-seed Leonardo Mayer of Argentina 7-6 (7/3) 6-7 (4/7) 6-3.
                  
Alexandr Dolgopolov was another leading name to fall on Thursday, the fourth seed suffering a third straight loss in his comeback from a knee operation, going down 6-4 6-7 (2-7) 7-6 (7-4) to Adrian Mannarino of France.