On March 15, 1993, at 6 a.m., with the station still struggling, WKSZ became "Z100," switching to a Top 40 format. The flip came three days after Eagle 106 gave up Top 40 and switched to smooth jazz, creating an opening which WKSZ hoped to fill. New York's WHTZ, located on the same frequency of 100.3 MHz, and calling itself "Z100" since 1983, demanded that WKSZ drop the name to avoid listener confusion. After a brief legal battle, the call sign and name were changed to WPLY, "Y100."