World Lightweight Title defense against Bob Montgomery, August 1947

In one of his most important title defenses, he achieved a knockout of black boxer Bob Montgomery, NYSAC Lightweight Champion, at Municipal Stadium in Philadelphia in six rounds on August 4, 1947, to become the undisputed World Lightweight Champion. Montgomery was down for a count of nine in the sixth before the bout was stopped. The victory also avenged a twelfth-round knockout loss to Montgomery from January 25, 1944.^[4] At least one source had Williams with an edge in three of the rounds, with one to Montgomery, and one too close to call. The blow that sent Montgomery to the mat in the sixth was a right to the chin by the hard punching Williams. Montgomery rose after nine but continued to take punches and was up against the ropes, and sinking to the mat on his knees before the referee stopped the bout.^[9]

World Lightweight Title defense against Jesse Flores, September 1948

On September 23, 1948, Williams successfully defended his Lightweight title against Jesse Flores winning in a tenth-round technical knockout at Yankee Stadium in New York's Bronx. Flores had been on the mat five times during the fight, down twice in the fifth and twice in the eighth. The final blows were a left hook and then a right that sent Flores to the mat 2:07 into the tenth round.^[10]

World Lightweight Title defense against Enrique Bolanos, July 1949

On July 21, 1949, Williams defended his title against Enrique Bolanos winning in a fourth-round technical knockout before a crowd of near 19,000 at Wrigley Field in Los Angeles. Bolanos had been sent to the canvas twice before referee Jack Dempsey decided to end the bout 2:40 into the fourth round. Bolanos was knocked to the mat for a count of eight early in the fourth, and then after rising received a series of left and right hooks that sent him to his knees near William's corner. Bolanos' manager George Parnassus threw in the towel and referee Dempsey abruptly ended the bout causing the fight to be recorded as a technical knock out.^[11]

World Lightweight Title defense against Freddy Dawson, December 1949

On December 5, 1949, Williams defeated Freddy Dawson in a close fifteen-round decision before 10,389 fans at Convention Hall in Philadelphia. He had defeated Dawson twice in previous meetings and led in the early betting. In the post-fight decision, the two judges gave him the decision by only one round, ruling that 8 rounds were won by him and 7 by Dawson. The referee, who was closer to the action, gave him 9 rounds to 6 for Dawson. There were no knockdowns in the bout, and according to one source only one hard solid punch, a hard left to Dawson's head in the fifth. Boxing reporters already were concerned about Williams' ability to make the lightweight limit prior to his bout with Dawson, an issue that would arise again in his bout with Jimmy Carter. There were several newspaper reports that wrote of Williams' fine for informing the press of a potential bribe of the judges he claimed he had heard about in a phone call. He was fined by the boxing commission for informing the press of the possible bribe before he had first informed the commission.^[12]

On January 17, 1949, Williams first defeated Johhny Bratton by a comfortable margin in the Arena in Philadelphia, Pennsylvania in a ten-round decision before a satisfied crowd of 8,000 fans. Williams had taken a two-month lay-off from his fight schedule to help heal a broken hand. The judges scored 6-2 and 7-3 for Bratton, while the referee scored a closer 5-4-1 decision. Bratton put up a defense, and even stunned Williams momentarily in the eighth with a blow to the jaw, but lacked the skills at 21 to defeat Williams.^[13] On January 20, 1950, before a crowd of 12,000 at Chicago Stadium, Williams won an eighth-round technical knockout against Bratton who was forced to leave the ring with a broken jaw. Bratton later claimed the injury took place in round three. Williams hammered his opponent particularly hard in the second and seventh rounds, and was comfortably ahead on points, losing only one of the eight rounds fought to Bratton. Bratton ended the bout by turning his back and signalling the referee to end the fight.^[14] After returning to boxing, Bratton would briefly take the NBA World Welterweight Championship in March 1951, holding it only two months.

Loss of World Lightweight Title against Jimmy Carter, May 1951

He held on to the crown until May 25, 1951, when he was stopped by Jimmy Carter in a fourteenth-round technical knockout at New York's Madison Square Garden.^[4] Williams had been sent to the canvas four times before the fight was called. Williams was down for a count of five and eight in the fifth. He was down for a count of four and then six in the fourteenth before the referee ended the fight. Williams believed that his trouble making weight had weakened him for the fight.^[15]

Williams, for part of his career, was managed by Frank "Blinky" Palermo, who later was suspected of having ties to organized crime. According to Williams, he was blackballed by the boxing managers guild when he sought to manage himself. Palermo informed him he could resolve his problems with the guild, and Williams agreed to let Palermo manage him. Williams testified before the Kefauver Commission that Palermo did not arrange for him to throw any fights, but that he shorted him his share of his purses. Nevertheless, Williams did claim to have taken a dive against Chuck Davey, a much hyped contender for the welterweight crown.^[4]