Diamondbacks place Big Unit on 15-day DL

The Arizona Diamondbacks placed pitcher Randy Johnson and outfielders Carlos Quentin and Jeff DaVanon on the 15-day disabled list Saturday. Quentin, who has a shoulder injury, was backdated to March 23. He could be available April 7. Johnson, who is returning from offseason back surgery, is scheduled to make three minor league starts before joining Arizona's rotation in the third week of April.