Reigning champion Germany and 2011 runner-up Argentina wrapped up round-robin wins Wednesday at the World Team Cup tennis event, a final clay-court French Open tuneup.
The Germans improved to 2-0 in the four-nation Blue Group with a 3-0 victory over Croatia (0-2) on the red clay at Rochusclub.
Philipp Kohlschreiber gave the host country an insurmountable 2-0 lead by beating Croat Lovro Zovko 6-2, 7-6 (7-2) in the second singles rubber, after Florian Mayer won an opening singles bout on Tuesday.
A meaningless doubles match saw a German tandem of Christopher Kas and Philipp Petzschner edge out a Croatian duo of Zovko and Ivan Dodig 6-4, 1-6, 10-3.
The Germans won a record-breaking fifth title with victory over the 2010 champion Argentines last year.
The Argentines moved to 2-0 in the Red Group following a 3-0 pasting of Japan (0-2). Carlos Berlocq clinched the win on Wednesday with a 6-3, 6-4 victory over Go Soeda, this after Leonardo Mayer picked up Argentina's first point with a singles win on Tuesday.
Another meaningless doubles match saw an Argentine tandem of Juan Pablo Brzezicki and Juan Ignacio Chela sneak past a Japanese pairing of Tatsuma Ito and Bumpei Sato 6-7 (3-7), 6-1, 10-7.
The United States, 0-2 in the Red Group, lost its sixth match in six tries this week when a Czech duo of Radek Stepanek and Frantisek Cermak topped a tandem of former world No. 1 Andy Roddick and Ryan Harrison 7-6 (7-5), 5-7, 10-8. The Czechs clinched the win over team USA with a pair of singles wins by Stepanek and former Wimbledon runner-up Tomas Berdych on Tuesday.
The Americans will face a fellow winless counterpart in Japan on Thursday.