VANCOUVER, JULY 29 -- The United States swept its three matches against France today to move into the quarterfinals of the Federation Cup.

Pam Shriver, playing singles because of an injury to top-ranked Martina Navratilova, defeated Isabelle Demongeot, 6-0, 7-6 (7-5). Chris Evert put away Nathalie Tauziat, 6-1, 6-0, and then, in the absence of Navratilova, Shriver's regular doubles partner, joined in the no-matter doubles victory.

It was Shriver-Evert by 6-1, 6-0 over Demengeot and Catharine Suire.

The United States and the other seven quarterfinalists earned spots in the main draw of the 1988 Olympics.

In the first two upsets of the tournament, unseeded Canada beat the unseeded Soviets, 2-1, and Britain defeated seventh-seeded Italy, 2-1. Canada will meet second-seeded Czechoslovakia in the quarterfinals, and Britain faces the top-seeded Americans.

Czechoslovakia, which won three straight Federation Cups before being dethroned by the Americans last year in Prague, advanced by sweeping its singles matches against Yugoslavia.

The Czechs, seeded second behind the United States, moved into the quarterfinals as Helena Sukova beat Karmen Skulj, 6-2, 6-3, and Hana Mandlikova topped Sabrina Goles, 6-4, 6-3.

West Germany, seeded third, advanced easily as Claudie Kohde-Kilsch stopped South Korea's Lee Jeong-Myung, 6-2, 6-1, and No. 2-ranked Steffi Graf defeated Kim Il-Soon, 6-1, 6-1.

"Today's tie breaker was a lot different than yesterday when I won 7-0," said Shriver of her singles match. "The game seemed to get complicated when I was down 5-2 in the tie breaker and I had to regroup."