Sasha Stallone, citing irreconcilable differences, has sued her husband, actor/director Sylvester Stallone, for divorce and is seeking custody of the couple's two children. Stallone, filming a sequel to the movie "First Blood," in which he starred, said in a statement: "Sasha and I are both grateful for the 10 years we have had together and we intend to remain good friends dedicated to our sons . . . even though we will no longer be husband and wife" . . .

In Newport, R.I., yesterday, Superior Court Judge Albert E. DeRobbio set a March 5 date for a retrial of Claus von Bu low, although Rhode Island's attorney general-elect has not decided whether to retry Von Bu low on charges of trying to kill his heiress wife. The move by DeRobbio was mainly procedural, because the court calendar must be set in advance. Attorney General-elect Arlene Violet said she will not make a decision on the case until she takes office Jan. 1 and reviews the evidence. . .

New York's "Mayflower Madam" lost a court battle yesterday. State Supreme Court Justice David Edwards dismissed an $18 million invasion of privacy suit filed by Sydney Biddle Barrows, the socialite accused of running a call-girl ring. She had sued her former boyfriend for selling nude photographs of her. . .

In Philadelphia, editor Ake W. Sjoberg sipped champagne yesterday. The first volume of a dictionary of Sumerian, which is the oldest known written language, was unveiled. University of Pennsylvania researchers say it could take them a half-century to complete the work. . .