March 6 (Reuters) - Davis Cup world group first round scores on Saturday (* denotes winning lead). Chile lead Israel 2-0 Croatia lead Ecuador 3-0* Serbia lead U.S. 2-1 Argentina lead Sweden 2-1 Spain lead Switzerland 2-1 France lead Germany 3-0* Czech Republic lead Belgium 3-0* Russia lead India 2-1 (Compiled by Infostrada Sports; Editing by Toby Davis)