Kirk Rueter of the Montreal Expos becomes the first major league pitcher since Fernando Valenzuela in 1981 to start his career with a 10-0 record as Montreal beats the Pirates, 3 – 2.

On April 29, 1994 — Kirk Rueter of the Montreal Expos becomes the first major league pitcher since Fernando Valenzuela in 1981 to start his career with a 10-0 record as Montreal beats the Pirates, 3 – 2.

Source
Baseball Reference April 29