Millionaire Running Stag and Irish group winner Bernstein were represented by their first winners June 5. Running Stag's son, Renga, won at 4 1/2 furlongs in :55.12 at Woodbine at first asking. Bred by Frank Stronach's Adena Springs, Renga races for Gerry Rizzardo and Terri Vella. Running Stag (Cozzene -- Fruhlingstag, by Orsini II) stands for $7,500 at Adena Springs South near Ocala, Fla.Bernstein's first winner, Rugula, won at Arlington Park at 4 1/2 furlongs in :52.67 in her first time out. Bred by Douglas Arnold, Rugula races for Andrew Logan and Joseph P. McKellar. Bernstein (Storm Cat -- La Affirmed, by Affirmed) stands for $7,500 at Arnold's Buck Pond Farm near Versailles, Ky.