BASEBALL American League * Boston Red Sox -- Placed Danny Darwin (pitcher) on the 15-day disabled list.

* Toronto Blue Jays -- Placed Al Leiter (pitcher) on the 15-day disabled list, retroactive to April 21. Recalled Willie Fraser (pitcher) from Syracuse of the International League.

National League * Philadelphia Phillies -- Fired Nick Leyva (manager). Named Jim Fregosi manager. Recalled Mickey Morandini (second baseman), Jim Lindeman (outfielder) and Danny Cox (pitcher) from Scranton-Wilkes-Barre of the International League. Released Dave LaPoint (pitcher). Sent Wes Chamberlain (outfielder) and Dave Hollins (third baseman) to Scranton-Wilkes-Barre.

BASKETBALL (NBA) * New York Knicks -- Named Ernie Grunfeld director of player personnel.

FOOTBALL (NFL) * Buffalo Bills -- Signed Lionel Manuel (wide receiver).

* Chicago Bears -- Signed Eric Ihnat (tight end) to a two-year contract.

* Detroit Lions -- Signed Greg Jones (quarterback).

* Kansas City Chiefs -- Signed Eric Hoskins (defensive back).

* New York Jets -- Signed Jim Scully (linebacker).