[1] On February 26, 1933, Seelig defeated Helmut Hartkopp in a twelve-round points decision at the Flora Theatre to take the German BDB Light Heavyweight Title.

[3][1][4]On May 22, 1933, Seelig fought an important bout against IBU world middleweight champion Marcel Thil at the Palais de Sports in Paris, losing in a twelve-round points decision.

[2] Seelig competed unsuccessfully for the EBU European Middleweight Title on March 17, 1934, against Gustave Roth, losing in a fifteen rounds points decision in Brussels, Belgium.

[1] Seelig won a ten-round points decision against black Cuban boxer Kid Tunero on September 28, 1934, at the Salle Wagram in Paris.

Lacking boxing science and appearing wild at times when he took head shots while wading in, Seelig continued his attack, nonetheless, and rocked Rossi with hooks to the face and damaging blows to the midsection.

After Seelig was momentarily down to one knee from a terrific right hook to the jaw, he fought cautiously, realizing that long range fighting would not be his best bet against Bellanger who had a slight advantage in reach.

[6][1] In an impressive victory on December 2, 1935, Seelig defeated Mickey Walker, American former holder of both the world middleweight and welterweight championships, in the seventh round of a ten-round bout at New York's St. Nicholas Arena.

[7] Seelig won a unanimous fifteen-round decision against leading contender Paul Pirrone in Cleveland, Ohio, on December 16, 1935, retaining his standings in the top ten world middleweights.

"[1] Seelig defeated future NYSAC world middleweight champion Ken Overlin on December 20, 1938, in a close ten round unanimous points decision before 8,100, at New York Colliseum in the Bronx.

[17][18] On May 1, 1939, before 3,500 fans, accomplished world middleweight champion Fred Apostoli won an unpopular ten round points decision over Seelig in Cleveland, Ohio.

[19] Seelig's best round was the seventh when he smashed Apostoli's jaw with a right that caused the champion to clinch and cover, and gained the support of a number of fans.

On December 11, 1939, Seelig fought an NBA world middleweight title match against Al Hostak before an enthusiastic crowd of 10,000 at the Arena in Cleveland, Ohio, losing in a first-round knockout of a scheduled fifteen rounds.

Seelig sparred cautiously in the opening of the round, but was sent to the canvas from a crushing left hook to the right side of his jaw, and could not resume the bout until a count of nine was completed.

[20][21] In his last bout, Seelig lost to top rated heavyweight contender Tami Mauriello in the feature fight at the Bronx's New York Colliseum in a seventh-round technical knockout on December 3, 1940.