Czech Republic beats US at tennis Team World Cup

DUESSELDORF, Germany (AP) - The United States fell to its second straight defeat at the Team World Cup and Serbia posted its second victory in two matches on Tuesday.

Tomas Berdych and Radek Stepanek won their singles in straight sets, Berdych defeating Andy Roddick 6-1, 6-2 and Stepanek cruising past James Blake 6-2, 6-1.

Serbia also took an unassailable 2-0 lead over Russia.

Viktor Troicki lost only seven points on serve in a 6-3, 6-2 victory over Dmitry Tursunov. Janko Tipsarevic secured Serbia's victory by defeating Alex Bogomolov Jr. 6-1, 6-3.

Russia fell to 0-2.

Defending champion Germany made a winning start to its second Blue Group clash as Florian Mayer dismissed Croatia's Ivan Dodig 6-1, 6-1.

Argentina took a 1-0 lead over Japan in a Red Group match when Leonardo Mayer defeated Japan's Tatsuma Ito 6-4, 6-4.