Jadick once admitted he patterned his style of boxing from Tommy Loughran, a famous Philadelphian light heavyweight champion, also managed briefly by Burns in his early career.

He defeated English-born Jewish lightweight boxing great Al Foreman on May 21, 1928, in an eight-round points decision at the Polo Grounds in New York.

[1] On August 8, 1928, Jadick lost to Dick "Honeyboy" Finnegan, considered a serious Jr. Lightweight contender, at Braves Field in Boston, Massachusetts, in a ten-round points decision.

[6] Jadick had defeated Finnegan two months earlier fighting in the lightweight range in a ten-round points decision in his hometown at Shibe Park in Philadelphia before an enormous crowd of 18,000.

[9] On January 11, 1929, Jadick faced a seventh round disqualification for holding against Jewish great Louis "Kid" Kaplan at the Boston Garden.

On November 25, 1929, Jadick defeated Henry Tuttle, known as King Tut, a noted Minneapolis lightweight, in an important eighth round Technical Knockout.

Their feature match in Philadelphia before a crowd of 7,000, catapulted Jadick to greater recognition, at least among regional boxing fans and officials.

[10][11] One year later, Jadick defeated Tut again on October 4, 1930, in a ten-round points decision in Milwaukee, dashing Tuttle's hopes of becoming a lightweight contender.

[1] On December 8, 1930, at 132 pounds, Jadick first met exceptional boxer Benny Bass, in a non-title fight, losing in a close ten round unanimous points decision at the Arena in Philadelphia.

Bass, stockier built, pressed the fighting in most of the bout and appeared stronger than Jadick, who had a reliable scientific defense partly due to his six-inch advantage in reach.

[13] On November 30, 1931, Jadick lost to Herrera at Motor Square Garden in Pittsburgh in a sixth round Technical Knockout just six weeks before the most important victory of his career against Tony Canzoneri.

[15] On January 18, 1932, Jadick became the World Light Welterweight Champion after a ten-round Unanimous Decision against Tony Canzoneri at the Arena in Philadelphia, Pennsylvania.

[1] In a very significant win in a sanctioned light welterweight title match, Jadick defeated Tony Canzoneri, on July 18, 1932, for the second time.

The two light welterweights fought a ten-round split decision at Shibe Park in Philadelphia with Jadick scientifically warding off the more aggressive Canzoneri.

On November 17, 1933, Jadick beat Pete Nebo for the first time, defeating him in a ten-round points decision at the Cambria Athletic Club in Philadelphia.

[1] In a noteworthy win, on February 18, 1935, Jadick, at 137 pounds, defeated Fritzie Zivic, 1940 NBA World Welterweight Champion, in a ten-round points decision at the Auditorium in Washington, D. C.[21] At 145 1/4 pounds, on July 22, 1936, Jadick lost to 1940 Welterweight Champion as recognized by Maryland, Izzy Jannazzo, in a ten-round points decision at the Dykman Oval in Manhattan.

In a decisive win, Jannazzo, soon to be a top welterweight contender, put Jadick on the canvas in the first, fourth and sixth rounds.