brief! yU.S. Amateur champ is pro unexpectedlyFrom Sun dispatchesNEW YORK—Steve Melnyk, the 1969 United States Amateur champion, has forfeited his amateur status as a result of accepting six dozen golf balls at Augusta, Ga., before the 1970 Masters, the U.S. Golf Association has announced. Melnyk said he did not use the balls, but gave them away.WEST HEMPSTEAD, N.Y.-Referee Andy Hershock of Philadelphia collapsed and died Wednesday night while officiating an American Basketball Association game between Memphis Pros and New York Nets. Hershock, 43. father of 11, who joined the ABA upon its founding four years ago, went to the Memphis bench during a timeout late in the first period, complaining he was dizzy. While he attempted to rise from the bench, he collapsed.QUEBEC—Teams from Europe, the United States, six provinces and the Northwest Territories will compete in the 1971 Quebec international peewee hockey tournament, the tournament's president said Wednesday. Gerard Bolduc told a news conference that 102 teams, the same number that competed last year, will take part Feb. 12-20.LONDON—Boxing entries for the 1976 Olympic Games in Montreal may have to be restricted, Lt.-Col. R. Russell, president of the International Amateur Boxing Federation, said Wednesday night. Russell said he had told the International Olympic Committee that the boxing federation would have to give serious consideration to limiting the number of entries from any one country to seven or eight.OTTAWA—Canada s national ski jumping team will travel to Lake Placid, N.Y. this weekend for its first major test of the new season. Members of the team, under national coach Slavomir Kardas, have been in training at nearby Camp Fortune, Que., for the last few weeks.