Dominican Republic won in straight sets against Canada to remain undefeated ©NORCECA

The United States and the home favourites Dominican Republic have won four matches from four to remain undefeated at the Women's Volleyball Pan American Cup, as the two sides get ready to face each other tomorrow to decide the top qualifier from the preliminary round in Santo Domingo.

The hosts defeated Canada in consecutive games 25-11, 25-15, 25-20 to conclude the fourth day of competition.

Dominican Republic's top scorer was again Gaila Gonzalez, who contributed 12 points, including three blocks and two aces, while Jineiry Martinez scored nine for her team.

Hillary Howe scored 10 for the Canadians, but they were soundly beaten by the favourites.

"Our service was very aggressive today," said Marcos Kwiek, coach of Dominican Republic.

"After the first two sets we lowered the intensity of the serve a bit and Canada saw themselves serving strong. 

"I think that was also positive for us to face that difficulty to focus more on the game. 

"Nobody is going to give us anything."

A straight sets victory went the way of the Americans too, who beat Cuba 25-11, 25-17, 25-18 and were assisted by Veronica Jones-Perry who scored 14 points.

Alison Bastianelli scored 11 and Lindsay Stalzer claimed nine points to help the US to a convincing win.

Cuba are to play Puerto Rico in their final group game, with both sides yet to win a match.

Mexico came from a set down to secure their spot in the semi-finals with Canada after beating Puerto Rico 19-25, 25-15, 25-13, 25-15.

Karina Flores, Grecia Castro and Maria Rodriguez scored 50 points between them, with Flores contributing 18 herself.