The United States Basketball League hastily announced yesterday that it will end its inaugural season a month early because so many of its players are leaving to attend National Basketball Association camps.

Twenty-nine, or 42 percent, of the new summer league's 69 players have been invited to try out for NBA teams, and USBL officials said it would be in the best interests of the league and its fans not to restock with lower-caliber players.

The league had been scheduled to end its 40-game season Aug. 19, but in a prepared statement the league announced it would end its first season Sunday, after most of the teams will have played 25 games. League officials said a revised playoff schedule would be announced at a later date . . .

Competition among power forwards for a job with the Portland Trail Blazers is far from over but former Maryland standout Ben Coleman won the first round handily Wednesday in the Blazers' annual rookie game.

Coleman played last season in Italy and came to the Blazers in a draft-day trade with the Chicago Bulls. He hit all 12 of his shots from the field and finished with 27 points and 11 rebounds in 27 minutes of play.