December 26, 1910, was the exact date of Wilde's first professional boxing fight. That day, he boxed Les Williams to a no-decision in three rounds. His first win came on January 1 of 1911, knocking out Ted Roberts in the third round.
Wilde went undefeated for an amazing amount of 103 bouts, al of which were held in Great Britain. In the middle of that streak, he annexed the British flyweight championship by beating Billy Padden by a knockout in 18 rounds. He finally lost his undefeaed record when he challenged Tancy Lee for the European championship, getting knocked out in the 17th round. With that loss, Wilde also lost his British title.
Wilde then embarked on a 16 fight knockout winning streak, and on February 14 of 1916, he became world Flyweight champion by beating Joe Symonds; for the vacant belt;, bya knockout in 12 in London. He beat Johnny Rosner by a knockout in 11 to retain the title in Liverpool, and on May 13, he had two fights on the same da, winning both by knockout. His next fight was a rematch with Lee, and he gained revenge by knocking Lee out in the 11th to retain the world title. He finished the year retaining his belt against Young Zulu Kid, also by knockout in the 11th.
In 1917, he retained the title by beating George Clarke by a knockout in four. With that win, he also won the European title and recovered the British title. But that would be his last title defense, as soon he decided to vacate the world title. He kept fighting and winning, and in 1919, he beat Joe Lynch, another boxer who was a world champion, by decision in 15. In 1920 he went undefeated in 10 fighs, but then, he lost by a knockout in 17 to future world champion Pete Herman in 1921. That was the fight that marked his return to Great Britain after touring the United States all of 1920. After a win over Young Jennings, he announced his retirement, but he decided to make a comeback against Pancho Villa in 1923. After losing by a knockout in seven to The Phillippines' first world champion, Wilde announced his retirement.
In 1990, Wilde was elected into the International Boxing Hall Of Fame as a member of that institution's original class.
He had a record of 131 wins, 3 losses, 2 draws and 13 no-decisions, with 99 wins by knockout, which makes him one of the most prolific knockout winners of all time, according to Ring Magazine.