Sweden, Germany and the United States have 2-0 leads while defending champion Russia is tied with France after the first day of the Davis Cup tennis quarterfinal round.
At Moscow's Luzhniki arena, Paul-Henri Mathieu shocked the Russians with a four-set win over world No. 4 Nikolay Davydenko (2-6, 6-2, 6-1, 7-5). Mikhail Youzhny evened the best-of-five match series with a five set win over Richard Gasquet (6-2, 6-3, 6-7, 5-7, 8-6).
Meanwhile in Gothenberg, Sweden, Thomas Johansson scored a four-set win over David Nalbandian (6-7, 7-6, 6-2, 7-6). Robin Soderling then gave Sweden the advantage with a straight-sets win over Juan Martin del Potro (7-6, 7-6, 6-4).
In Ostend, Belgium, the German squad continued its dominance of the Belgians. Tommy Haas beat Kristof Vliegen in four sets (6-7, 7-5, 6-4, 6-2). Philipp Kohlschreiber scored a straight-sets win over Olivier Rochus (6-3, 7-5, 7-6).
The United States took a 1-0 lead over Spain when James Blake beat Tommy Robredo in straight sets 6-4, 6-3, 6-4. World No. 3 Andy Roddick gave the Americans the advantage with a straight-sets win over Fernando Verdasco of Spain in the second match (7-6, 6-1, 6-4).
The doubles matches are Saturday with the reverse singles Sunday. The winners this week advance to the Davis Cup semifinals in September.