Among those answering Hollywood casting calls:

Tom Selleck has signed to star as a fading baseball player who goes to Japan in "Tokyo Diamond," due to start filming in January . . . Therese Russell is joining Jeremy Irons in the cast of the thriller "Kafka," now filming in Prague . . . John Spencer, who played Detective Lipranzer in "Presumed Innocent," has become the 14th regular on NBC-TV's "L.A. Law," playing a rumpled but talented litigator . . . Charlton Heston is set to reprise his stage role as Sherlock Holmes in the TNT-TV movie "Crucifier of Blood," due to start filming in London late this month . . . "Let's Make a Deal" creator Monte Hall is back on the show as guest host on a "temporary" basis as the show tries to revive its sagging ratings.John Savage and Steven Berkoff have joined the cast of "Flynn," based on the exploits of Errol Flynn, now shooting in Fiji and Australia . . . Martin Short, Charles Grodin, Dabney Coleman and Mary Steenburgen have begun work in L.A. on "Clifford" . . . Kiefer Sutherland has signed to play a medic in "Article 99," also starring Ray Liotta.