MIAMI GARDENS, Florida – Jean Carlos Torres continued his knockout streak Sunday night.

The hard-hitting junior welterweight dropped Zack Kuhn twice during the second round before their scheduled eight-rounder was stopped on the Floyd Mayweather-Logan Paul undercard at Hard Rock Stadium. The 30-year-old Torres, who is promoted by Mayweather’s company, first floored Kuhn with a left hook early in the second round.

Kuhn got up, but Torres sent him to the canvas again with a short right hand. Their bout was stopped soon thereafter, 51 seconds into the second round.

Puerto Rico’s Torres (19-0, 15 KOs) has won eight straight bouts by knockout or technical knockout. Kuhn (10-8-1, 5 KOs), of Charleston, West Virginia, has suffered three consecutive knockout defeats.

Immediately before Torres’ knockout, Cincinnati’s Adrian Benton, another Mayweather Promotions prospect, out-pointed Pedro Cruz in their four-round lightweight bout. The 21-year-old Benton won all four rounds on each judge’s scorecard, 40-36.

The 21-year-old Benton improved to 5-0 and went the distance for just the second time against the 23-year-old Cruz (1-1, 1 KO), of San Jose, California.

Benton boxed mostly from a southpaw stance during the fourth round and attempted to keep Cruz at a distance with his jab.

Benton landed a hard right hand at almost the same time as Cruz connected with a straight left early in the third round. Benton out-landed Cruz during that round, when he fought from orthodox and southpaw stances.

Benton landed several straight right hands during the second round.

Benton fell to the canvas in the first round, but it was ruled a slip. He quickly traded with Cruz once he got up, but both boxers landed flush shots in the final minute of that opening round.

In the previous fight Sunday, Jalil Hackett, another Mayweather Promotions prospect, needed only one minute and one second to stop Angelo Diaz in a welterweight fight that was scheduled for four rounds. The 18-year-old Hackett, of Washington, D.C., jumped on Diaz as soon as their bout began and knocked him to the canvas with a straight right hand.

The 26-year-old Diaz (0-1), a southpaw from Odessa, Texas, tried to reach his feet. Referee Christopher Young waved an end to the bout as Diaz struggled to get up.

In the first fight Sunday, Dorian Khan Jr. beat up Jonathan Gray for almost two full rounds before Khan’s pro debut was stopped.

The 18-year-old Khan, of Buckeye, Arizona, knocked Gray to the canvas in the second round of their scheduled four-round junior lightweight bout. Referee Frank Santore stopped their fight with one second to go in the second round because Gray had taken too much punishment.

Khan landed a body shot that sent Gray to one knee early in the second round. Gray got up, but Khan unloaded an array of body and head shots Gray was able to take without going down again.

Khan, a southpaw, also is promoted by Mayweather’s company. The 34-year-old Gray (0-4), of La Plata, Maryland, has been knocked out in each of his four professional fights.

Keith Idec is a senior writer/columnist for BoxingScene.com. He can be reached on Twitter @Idecboxing.