Both lost in the opening round of the at the Stella Artois Championships.
David Nalbandian and Gaston Gaudio must oust Russians Marat Safin and Igor Andreev in the fourth round for Argentina to have four men in the quarter-finals.
Andy Murray maintained his hot start to the year as he led Britain into the final of the Hopman Cup with a 2-1 victory over Russia on Friday. The Scot put on a masterful display to crush Igor Andreev 6-1, 6-0 after Murray's teammate Laura Robson had been beaten 6-4, 6-0 by Elena Dementieva. Murray then joined his 15-year-old partner to beat the Russians 6-4, 6-7, 10-6 in the deciding mixed doubles.
The top seeds eaily beat the Russian pair of Denis Golovanov and Andrei Olhovskiy in a quarter-final match at the Moscow ATP event.
He won 6-4, 6-4 in a high-powered quarter-final at the Valencia claycourt Open on Friday.
Spaniards David Ferrer and Juan Carlos Ferrero also suffered first round shocks at the Valencia Open on Tuesday.
Dementieva will face third seed Maria Sharapova, who beat Martina Hingis, in the final of the Pacific Life Open.
The two will clash for the third time this year at the Indian Wells semi-final
Spain's Fernando Verdasco won the first ATP hard-court title of his career with a 6-4, 7-6 victory over American Sam Querrey in the New Haven Open on Saturday, just hours after he had won his semi-final.
Both nations took 2-1 leads in their semi-finals with doubles victories.
Russia's Igor Andreev powered to a 7-5, 6-2 win over third seed Rafael Nadal in the Valencia Open quarter-finals.
Argentina beat Russia 3-2 while Spain ended the reign of defending champions United States, winning the other semi-final 4-1.
Juan Martin del Potro demolished Igor Andreev in straight sets on Sunday to give Argentina a 3-2 win over Russia and send them into a Davis Cup final against Spain.
The defending champion beat Russian Igor Andreev in straight sets at the Tata Open tennis championship.
Three-time winners Sweden won a place in the final of the World Team Cup on Thursday after forging an unassailable 2-0 lead in their Red Group tie against the United States.
Philipp Kohlschreiber upset world No 4 Nikolay Davydenko to put Germany level after Igor Andreev trounced Germany's No 1 Tommy Haas in the opening rubber.
Juan Carlos Ferrero became the first seeded casualty at the US Open after he was beaten by fellow Spaniard Feliciano Lopez.
Daniil Medvedev continued his march towards a first Grand Slam title on Wednesday, powering into the US Open semi-finals with a clinical 7-6(6), 6-3, 7-6(5) victory over childhood friend Andrey Rublev.