Tomas Berdych and Radek Stepanek put defending champions CzechRepublic into the Davis Cup final by beating Argentina's Carlos Berlocq and Horacio Zeballos in the doubles on Saturday.
Top seed David Ferrer summed up his error-strewn defeat by qualifier Dmitry Tursunov as "one of the worst I have played" after falling at the first hurdle at the Barcelona Open on Wednesday.
Czech Republic's path to the Davis Cup final was wide open after they won the doubles on Saturday and Argentine Juan Martin del Potro pulled out of the reverse singles.
Swiss second seed Stanislas Wawrinka was pushed again to three sets before he progressed to the quarter-finals of the Buenos Aires Open on Wednesday.
A fit-again Rohan Bopanna and partner Frank Moser entered the second round of the ATP Challenger event in Italy with a straight-sets win over the wild card pair of Carlos Berlocq and Nicolas Todero. The top seeded Indo-German pair scored a 6-3, 6-4 win over the Argentine combination in the first round of the euro 42,500 clay-court event.
Former world number one Gustavo Kuerten opened his farewell tour with a first round defeat in front of his home fans on Tuesday, the 31-year-old falling 7-5, 6-1 to Argentina's Carlos Berlocq at the Brazil Open.
British pair Jamie Murray and Dominic Inglot defeated Canadians Daniel Nestor and Vasek Pospisil in four sets in Ottawa to give Britain a 2-1 lead ahead of Sunday's reverse singles.
Rafael Nadal, working his way back to top form after wrist problems last year, screamed with delight on reaching the Argentine Open semi-finals with a 6-1 6-1 rout of Federico Delbonis on Friday.
Rafael Nadal made up for his semi-final defeat at the Rio Open a week ago by reaching the Argentine Open final with a 7-6, 6-2 victory over Carlos Berlocq.
Raucous home support for holders Argentina did not make up for the absence of Juan Martin del Potro and Federico Delbonis on Friday as they fell 2-0 behind to Italy in the first round of the Davis Cup.
Steady rain hit the US Open on Monday, washing out the last match on Arthur Ashe Stadium court featuring five-time champion Roger Federer.
Brothers Jamie and Andy Murray claimed a tense four-hour doubles rubber against Australian pair Lleyton Hewitt and Sam Groth on Saturday to put Britain 2-1 up and on the verge of a first Davis Cup final since 1978.
Roger Federer continued his smooth progress at the French Open on Friday with a straightforward 6-4, 6-3, 6-2 defeat of Bosnian Damir Dzumhur to reach the fourth round.
Novak Djokovic spurred Serbia to a 3-0 win over neighbours Croatia in the first round of the Davis Cup on Saturday and they will be joined in the quarter-finals by an equally rampant France.
Serbia carved out a 2-0 lead over rivals Croatia while Britain led the US by the same score and holders Switzerland were tied with Belgium in the Davis Cup.
A round-up of results from Davis Cup matches played on Saturday and Sunday