While with the Indians, Cincinnati Reds manager Hank O'Day brought him in for a trial to make the major league roster, which was unsuccessful.

[1] Jasper joined the Chicago White Sox and made his major league debut on April 19, 1914.

In 16 games for the White Sox, Jasper had a 1-0 record and a 3.34 earned run average (ERA).

Near the end of the season, he was sent to Los Angeles, but again refused to report; it was not until March the following year when he decided to join the team.

Jasper's last stint in the major leagues was with the Cleveland Indians; in 12 games he had a 4-5 record and a 3.59 ERA.