We made it look easy tonight. This is a blessing. We wanted to come out here and establish that I was the better fighter and we made that happen." In the fight, Porter suffered a damaged right eye due to accidental clash of heads. Golden Boy announced on March 12, 2014, Porter would defend his newly won world title on April 19, against former world welterweight champion Paulie Malignaggi (33–5, 7 KOs) on the undercard of Bernard Hopkins vs. Beibut Shumenov at the DC Armory in Washington. Porter entered as the # 6 welterweight contender in the world according to The Ring Magazine. Malignaggi was ranked as the # 8 contender. Porter won via 4th-round TKO. A double jab opened a cut under the left eye of Malignaggi in round one. Porter had a huge second round, badly rocking Malignaggi multiple times. In round four, Porter hurt Malignaggi with a lunging left hook moments later and a barrage, which included a couple of clean right hands which sent Malignaggi down and under the bottom rope. The referee waved an end to the bout without beginning a count. In the post fight, Porter said, "The objective was to use the jab and get to the body, and it all worked. The first knockdown, he knew that right hand was going to come all night. [In the fourth round], it was a big right hand. He knew it would land all night. We kept throwing it." Malignaggi was humble in defeat, "He has potential to be great, and I told him to go be great I'm not sure what I'm going to do. I don't want to lose to an average champion. I want to lose to a great champion. If this is my last fight, I hope I lost to a great champion." Porter was ordered by the IBF to make his next mandatory defense against Kell Brook (32–0, 22 KOs). The fight took place on August 16, 2014 at the StubHub Center in Carson, California. Brook defeated Porter for the title via 12 round majority decision. Two American judges scored it (117–111 and 116–112) for Brook while the English judge scored it (114–114). Brook landed 158 of his 441 punches (36%), mostly jabs. Porter threw 308 more power punches, in total landing 156 of 626 thrown (25%). Porter felt as though he won the fight, "I thought that I was effective with my attack, but he was ready.