The federation wants to hold more round-robin competitions and tournaments with more than one winner.
The Americans will play their round-robin games at the Arizona Diamondbacks' Chase Field in Phoenix.
The USA have now won all three of their round-robin matches and will progress straight to the quarter-finals.
Second seed Zvonareva cruised past Jelena Jankovic 6-3 6-0 in the opening round-robin match in the White Group.
The All Weights round-robin was one of the biggest I have organised at the club since the 1970s.
According to the Department of Defence, as many as 2, 900 jobs outside the base depend on this round-robin effect.
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The eight teams will play on a round-robin basis with the top two from each group progressing to the semi.
Hendry will need to beat Murphy in Friday's final best-of-six round-robin match, while a draw would be good enough for Murphy.
But Canada survived a frantic finale to reach the final against a US side which beat them 5-3 in the round-robin stage.
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The 22-year-old Scot won 6-3 3-6 6-2 in front of 17, 000 spectators to take an early lead in Group A of the round-robin phase.
The eight franchises will play each other in a round-robin format, with the top four sides qualifying for semi-finals on 30 and 31 May.
Politicians' ritual slanging matches should not be allowed to distract Canadians from weightier battles, such as the bobsleigh, the giant slalom or round-robin curling.
But Belgium's Xavier Malisse was forced to pull out of the eight-man round-robin tournament after retiring with a leg injury against Frenchman Sebastien Grosjean .
Federer and Nalbandian have been drawn in the Red Group of round-robin matches along with Ivan Ljubicic and Andy Roddick, who play later on Sunday.
He has failed to win a tournament since May, but went into the round-robin opener as favorite against an opponent making his first opponent in the finals.
The 14 teams are divided into two groups of seven and after a round-robin section the top four from each group will go through to the quarter-finals.
This event is what it is -- the format being eight players, only men, indoors, round-robin -- it speaks for itself as being totally different from a grand slam.
By losing the first set, Federer ended the hopes of 2007 runner-up Ferrer -- who beat Janko Tipsarevic 4-6 6-3 6-1in the final match of the round-robin stage on Saturday.
Davydenko, seeded sixth, had begun the week with a thrilling three-set loss to Djokovic in round-robin play, but proceeded to rack up four straight victories, culminating in his emphatic win over fifth-ranked Del Potro.
The tournament format sees the eight teams split into two groups of four for a round-robin stage, before the top two teams from each group progress to knock-out semi-finals and then the final on June 28.
There was huge criticism of the protracted 2007 World Cup in the Caribbean where group stages were followed by a round-robin Super Eight phase before the two semi-finals, and the tournament comprised 51 matches in total.
Del Potro beat Federer in last month's Basel final but has a losing 13-3 record against him despite notable victories in the 2009 U.S. Open title match and in the round-robin stage of that year's ATP finals.
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The 1994 finals were the first in which three points were awarded for a win and one for a draw in the round-robin stage--previously, it had been two points for a win and one for a draw.
No sporting event has greater popularity or higher stakes than soccer's World Cup, and they manage to sort that whole clambake out in about a month with a round-robin group stage that shifts to a single-elimination knockout round.
Spain may have reached a World Cup semi-final for the first time - their fourth place in 1950 was after a round-robin stage - but they will surely need to improve if they are to defeat in-form Germany in Durban on Wednesday.
Berdych, the 16th seed, beat Argentine Horacio Zeballos 6-4 7-5 to secure his place in the next round, while fifth seed Robin Soderling of Sweden was more impressive in a 6-1 6-2 hammering of Germany's Philipp Petzschner.
World number one Rafael Nadal will face Florent Serra in the second round after the Frenchman beat Guillermo Canas, and there were first-round wins for Radek Stepanek, Ivan Ljubicic, Philipp Kohlschreiber, Robin Soderling and Andy Roddick.
Defending champion Federer meets Australia's Peter Luczak in the first round, but could face his fellow Swiss Stanislas Wawrinka, last-year's runner-up Robin Soderling, Latvia's in-form Ernests Gulbis and Murray en route to the final.
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