Between 1923 and 1936, Berg had 192 professional fights, winning 157 of them. His record was 157–26–9. Fifty seven wins were by knock out. In 1931 he moved to the US, where he won 64 out of 76 fights there. During his bouts in America, he was trained by legendary boxing trainer
Ray Arcel. In 1930, Berg defeated the great
Cuban fighter
Kid Chocolate in ten rounds. The Chocolate bout, fought in Queens, New York in 1932, had 10,000 spectators, larger than many of his British bouts. In 1930, he knocked out the American champion
Mushy Callahan to take the World Light Welterweight Championship in London. The
National Boxing Association (NBA) had stripped Callahan before this fight and Britain did not recognize this division, so only the New York State Athletic Commission recognized Berg as champion after this fight. The NBA only recognized Berg as champion after he beat Goldie Hess in January 1931. Berg fought as a
lightweight when he put his title on the line to meet with
Tony Canzoneri in Chicago on 24 April 1931. He was quickly knocked out in three rounds, falling on his face and stumbling to get up before giving in and collapsing into the ropes. Berg, contending that he lost at lightweight and not at light welterweight, continued to claim that he was champion. Most of the boxing world recognized Canzoneri, however. He unsuccessfully challenged Canzoneri again for the title in September 1931. After the Canzoneri bout, Berg continued boxing with mixed results. He became British lightweight champion in 1934 by beating the title holder
Harry Mizler, another Jewish boxer. He was thrust back into the limelight as a replacement for the injured Canzoneri against Cleto Locatelli at
Madison Square Garden, but his hopes of challenging for the world title faded after a points defeat to Gustave Humery in Paris in February 1935, also losing a return bout in London in April, although Berg was still British champion at this point. Later that year he lost to
Laurie Stevens in a fight for the British Empire lightweight title in
Johannesburg. He returned to fighting at welterweight in the United States with some success. In August 1936, after three straight defeats, he announced his retirement, but returned in January 1937 with a victory against Ivor Pickens, the first of a nine fight unbeaten run. In January 1941 he moved up to middleweight to fight Harry Craster. He again beat Mizler in February 1941 and defeated British lightweight champion
Eric Boon on a disqualification due to a low blow in a non-title fight in April 1941. After a victory over Eric Dolby in March 1945, Berg expressed a desire to once more challenge for a title, saying "What I need is fights. I'm a bad gymnasium worker, but I'll show what I can do in the ring. When I've had a few warm up fights I'll know where I stand. If I'm no good I'll quit." He had two further fights, the last a win by knockout against Johnny MacDonald in May 1945, before retiring. Berg's brother Teddy was also a boxer, and the two fought on the same bill in 1941. After retiring from boxing, he worked as a film stunt man, joined the Royal Air Force, and owned a restaurant in London. ==Personal life==