United States look to surprise favourite Spain in Davis Cup

Even without Rafael Nadal, Spain presents a formidable challenge to the United States' bid to reach the Davis Cup final.

The defending champion welcomes the Americans having won the last two ties between the teams. Spain hasn't lost on clay, or on home soil, in 13 years.

While the U.S. has won its last four straight ties on clay, Spain has won 25 straight. Singles players David Ferrer and Nicolas Almagro are a combined 21-1 on the surface, making Nadal's injury absence a minor issue for captain Alex Corretja.

Americans Jon Isner and Sam Querrey are a combined 6-7 on clay.

Almagro says "we're a slight favourite."