Sloat's eleven-season professional career began in the minor leagues in 1938 and was interrupted for four years during the World War II period, when he served in the United States Army.

[1] Sloat's contract was acquired by the Brooklyn Dodgers during the war when they purchased the St. Paul Saints of the American Association.

In his lone start, on May 8 against the Cubs at Wrigley Field, he allowed four earned runs in 42⁄3 innings pitched and was tagged with the 6–0 loss.

In his only start in a Chicago uniform, Sloat earned a no-decision on April 24 at Sportsman's Park against the contending St. Louis Cardinals, going four innings and permitting two earned runs in a game St. Louis ultimately captured 5–4 in their final at bat in the ninth frame.

[3] In his nine big-league appearances, Sloat posted a won–lost record of 0–1 and an earned run average of 6.61, with two games finished in relief.