Considered by baseball insiders and historians as an unlucky pitcher, Warhop had a career 69–92 win–loss record, but with a 3.12 earned run average while playing for mostly second division Highlanders/Yankees teams.

As many as a dozen teams were interested in Warhop, and he signed a $1,000 contract ($33,911 in today's dollars) with the Detroit Tigers.

He was shelled on May 9 in a 10–0 loss against a Detroit Tigers lineup featuring Ty Cobb, Sam Crawford and Jim Delahanty, giving up runs in each of the first four innings.

[11] This began a quality stretch for Warhop, who won five consecutive games by July 17, a result of an improvement in his control.

The Highlanders lost when Earle Gardner booted a routine ground ball by Bill Donovan in a rushed attempt to throw out the go-ahead runner at home plate.

[14] Warhop's penchant for tough luck was best exemplified in the 1912 season, when he finished with a 10–19 record, the second highest number of losses in the AL, despite compiling a 2.86 ERA and 6.7 Wins Above Replacement (WAR).

[16] Towards the end of the season, Warhop was again on the losing side of a bad luck game, when he lost a 3–0 pitchers' duel against the St. Louis Browns, having held them scoreless for the first five innings.

[1][9] In one of those games, on July 25, Warhop shutout the Chicago White Sox for twelve innings before losing 1–0 in the 13th, due to two errors—one of which was committed by himself on an errant throw to first base after a sacrifice bunt.

[19] He led the American League in home runs allowed at the end of the season with eight, a very high number in the dead-ball era.

Warhop threw a fastball in the third inning, and Ruth hit the ball to the upper right field stands.

[3] He was released alongside first baseman Charlie Mullen and catcher Ed Sweeney on August 14 and then sold to Jack Dunn of the Richmond Climbers in the International League, but Warhop didn't play a game with them.

[6] In 1927, he pitched and won both games of a doubleheader, a rare achievement, while with Bridgeport of the Eastern League at age 42.

[24] He played semi-professional baseball until the age of 50, when he retired and became a butler for a large house in Long Island.