Promoter Don King came close yesterday to challenging a federal grand jury in Baltimore to invite him to testify in an investigation of the U.S. Boxing Championships bouts held in Annapolis Feb. 13.

"There is no way they can have an investigation without me," King was quoted in New York City by the Associated Press, saying he had not been subpoenaed.

"After the ludicrous remarks by Scott LeDoux, I think it's only fitting and proper there is an investigation to vindicate the credibility of the tournament, I know I will be exonerated."

Richmard J. Gunn, an attorney in Minneapolis and comanager of LeDoux, appeared before the Maryland State Athletic Commission in an "informal" hearing yesterday monitored by a Federal Bureau of Investigation representative.

Jack Cohen, executive secretary of the Maryland Commission, said Gunn was "plea-bargaining" over charges of ungentlemanly conduct against LeDoux for causing a disturbance after he thoughts he was done out of a decision over Johnny Boudreaux.

Cohen reported that Gunni said comanager Joe Daskiewicz and LeDoux wanted a formal hearing without a couple of weeks and that ground rules were set up. Cohen described the meeting as "amiable."

Gunn previously told The Washington Post that Al Braverman, an occasional consultant to promoter King, was engaged in 1975 to represent LeDoux in getting him bouts with George Foreman, Dino Dennis and for the U.S. Boxing Championships bout against Boudreaux.

Gunn said Braverman was paid 10 per cent of LeDoux's purses for those bouts. LeDoux's purse for fighting Boudreaux was $15,000.

Daskiewicz said yesterday that LeDoux's attorney, Steve Grossman of Minneapolis, had advised the boxer against testifying voluntarily to the grand jury, but LeDoux was subsequently subpoenaed.

Daskiewicz said LeDoux was instructed not to discuss his testimony before the grand jury, even with Daskiewicz.

Daskiewicz said that a representative of the FBI called him about LeDoux's charges that associates of promoter King, Braverman and Paddy Flood controlled most of the boxers in the tournament and that ring officials engaged by the tournament were biased.

"I told the FBI man I would testify that I had nothing to hide," Daskiewicz said.