After struggling through a mediocre season in 1912, Seaton became a dominating pitcher in 1913 appearing in 52 games and compiling a 27–12 record in 322 innings. After a dispute involving his wife and the Phillies, Seaton signed with the Brooklyn Tip-Tops of the Federal League. Seaton went 25–14 that year. Seaton struggled in 1915.
After the Federal League folded after the 1915 season, Seaton pitched for the Chicago Cubs. He eventually was released and returned to the Pacific Coast League.
After the Black Sox Scandal of 1919, Seaton and Luther "Casey" Smith were released in May 1920 due to rumors "...regarding the practices of the players (Seaton and Smith) and their associates."