TOKYO (AP) _ The United States, Soviet Union and Japan won Group A opening-day matches in the World Cup men's volleyball tournament on Friday.

The United States beat Chile 15-6, 15-5, 15-2, European champions Soviet Union defeated Tunisia 15-4, 15-7, 15-5, and Japan crushed Mexico 15-4, 15-5, 15-1.

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SAITACHO, Japan (AP) - Laura Davies of Britain, the 1987 U.S. Women's Open champion, shot a 6-under-par 66 Friday and took a two-shot lead after the first round of the Elleair Women's Open.

South Korea's Kim Ae-sook was in second place, and another stroke back was Fukumi Tani of Japan.

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PORTLAND, Ore. (AP) - A back ailment has forced national figure skating champion Tonya Harding to withdraw from a Japanese event in December.

Harding was to compete against Midori Ito of Japan in the NHK Trophy at Hiroshima Dec. 12-14. Harding and Ito are the only women skaters who can land the triple axel jump.

Harding she pulled a back muscle Nov. 4 during a skating practice.

''My doctor recommended that I not skate until it doesn't hurt,'' she said.

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SOUTH BEND, Ind. (AP) - Richard Phelps, the father of former Notre Dame basketball coach Digger Phelps, died Thursday in his hometown of Beacon, N.Y., the university announced Friday. He was 79.

Digger Phelps, whose first name also is Richard, got his nickname working parttime for his father, who was a funeral director. Digger Phelps retired from coaching this year after 20 seasons.

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MILAN, Italy (AP) - The head of soccer's world governing body said Baltic countries soon will join the organization and their teams will be put in the qualifying groups for the 1994 World Cup in the United States.

Joao Havelange said in an interview published Friday that all federations from countries recognized by the United Nations are eligible for the FIFA, the International Soccer Federation.

''Lithuania, Estonia and Latvia all have been recognized. They will be listed as provisional members of FIFA and entered in the next World Cup,'' Havelange told the Italian sports daily Gazzetta dello Sport of Milan.

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GORIZIA, Italy (AP) - Olympia Ljubljana will play its home games in European Cup basketball competition in this north Italian city, the Slovenian team announced Friday.

The International Basketball Federation recommended the move because of violence and political unrest in Croatia.