Upon his graduation from OU, Kahler signed with the
Lima Cigarmakers, a
Class D level baseball team. In late 1909 he moved to the
Columbus Senators of the
American Association, making $150 per month to start. He had an outstanding 20-7 record starting for the Senators. In 1910 he was sold to the Cleveland Naps, boosting his salary to $300 per month and making him the first OU graduate to make it to the MLB. Kahler was the second pitcher to use the
emery ball, after
Russ Ford. This now-illegal pitch consisted of scarring the ball to be able to achieve unnatural movement. He learned this trick while playing in the minors. Kahler had a relatively large stature for a pitcher; he was listed as about 6 feet tall and weighed approximately 183 pounds. This was sometimes a disadvantage for him. His large stature delayed his pitching delivery, making base stealing much easier for base runners. Kahler joined the majors during a period known as the
dead-ball era, a time when pitching dominated and batting was more strategic. In 1911 he was awarded a $600 bonus for finishing the season with an even or above pitching record. Kahler had a confrontation with
Detroit Tigers outfielder
Ty Cobb in the 1912 season. Kahler hit Cobb with a pitch early in the season, infuriating Cobb and causing him to plan his retaliation. On April 22, 1912, Cobb and Kahler faced off again. This time Cobb hit a grounder to first base. As Kahler ran to cover the first base bag, Cobb tried to injure him with his cleats but missed in his attempt and fell to ground. Kahler, knowing Cobb's intention, stood over him and threatened to "put him out for the rest of the season" if he did it again. Kahler was known for his toughness on the mound. He played through a slipped tendon in his throwing arm for 14 innings against Toledo. In one game, he knocked down a line drive with his bare hand and was also hit in the ankle and shoulder by hard hit balls yet still pitched 11 innings against Minneapolis. Hall of Fame player and manager
Connie Mack described Kahler as "a man who can win against odds; one who will live through a lot of hits and come out with a victory." From Cleveland, he was sold to Portland of the
Pacific Coast League where he immediately became the highest paid player in the league. He bounced around several minor league teams, going 13-7, until he was released by the Columbus Senators on June 11, 1917. ==Post-baseball career==