SEATTLE, JULY 23 -- The U.S. men's basketball team had a fight on its hands in its Goodwill Games opener tonight.

Puerto Rico gave the United States all it could handle before the Americans prevailed, 100-94, behind Billy Owens's 34 points and the late heroics of Kenny Anderson in a game interrupted by a bench-clearing fight in the first half.

The fight between Alonzo Mourning of the United States and Jose Ortiz of Puerto Rico started with 8:01 left in the first half.

Mourning made the first of two free throws and, as the ball went through the basket, Ortiz and Mark Randall of Kansas went to the floor.

Mourning, a Georgetown forward, said something to Ortiz, who slapped him in the face. Mourning retaliated with a punch. Ramon Rivas threw a punch at Mourning from behind as both benches emptied.

Order was restored, but Mourning and Ortiz were ejected. An FIBA committee said there would be no further discipline. Soviet Reportedly Defects

Soviet national hockey team center Sergei Fedorov has defected and is on his way to Detroit to play for the Red Wings, two Detroit television stations reported tonight, and Turner Broadcasting said the Red Wings confirmed the defection.

Fedorov, who did not travel with the Soviet team from Portland, Ore., to Seattle for the preliminary rounds, either was on his way to Detroit or already had arrived late Monday, WDIV-TV reported.

The station, quoting unidentified sources in Seattle and Detroit, said Fedorov, 20, wanted to join the Red Wings and team officials were talking with him. He was Detroit's fourth-round draft pick in 1989. But TBS said the NHL team had confirmed the defection.

"We are aware he is not with the team," said Richard Smith, district director for the federal Immigration and Naturalization Service in Seattle.

Fedorov last was seen by Soviet team officials about 11 p.m. Sunday after he played in an exhibition game against the U.S. team, said an official of USA Hockey, the governing body for U.S. amateur hockey.Economics of Swimming

There has been a lot of talk about how much appearance money certain high-profile athletes received to participate in the Goodwill Games, but swimmer Matt Biondi has made it clear how much he got: nothing.

"Ted Turner paid the federations, who in turn paid the top athletes," Biondi said. "U.S. Swimming kept the money. We got nothing."

Swimming officials say the money is going into the national governing body's sports programs, but Biondi wonders what is going on when people like sprinter Carl Lewis make a reported $25,000, heptathlete Jackie Joyner-Kersee receives about $20,000, and figure skater Jill Trenary gets what is believed to be $30,000.

"We're still living in the '70s in swimming," Biondi said. "I had to have seven medals to get {publicity and endorsements} out of my sport."