By Keith Idec

LAS VEGAS – Below are results from the Terence Crawford-Jeff Horn undercard Saturday at MGM Grand Garden Arena:

Featherweight prospect Shakur Stevenson knocked down Aelio Mesquita five times in less than two rounds to win by technical knockout.

The 20-year-old Stevenson (7-0, 4 KOs), a 2016 Olympic silver medalist from Newark, New Jersey, dropped Mesquita three times in the second round, after flooring him twice in the first round. Referee Benjy Esteves Jr. stopped their scheduled eight-round match at 1:45 of the second round, once Mesquita fell to the canvas for the fifth time.

Esteves deducted a point from Stevenson following the fourth knockdown for hitting Mesquita when he was down.

Brazil’s Mesquita (16-2, 14 KOs) lost a second straight fight by technical knockout.

Maxim Dadashev defeated Darleys Perez by technical knockout in the 10th and final round of a super lightweight fight.

Their fight was very competitive before Dadashev hurt Perez by landing a right hand that buckled Perez’s knees with just under two minutes to go in the 10th round. Once Dadashev realized Perez was hurt, he attacked him and eventually landed an overhand right to the side of Perez’s head that dropped him to the seat of his trunks.

Perez got up, but referee Jay Nady decided he shouldn’t continue. Their fight was stopped 1:49 into the 10th round.

The 27-year-old Dadashev (11-0, 10 KOs) won the vacant NABF and USBA 140-pound championships.

Perez (33-4-2, 21 KOs), a former WBA world lightweight champion, lost by knockout or technical knockout for the third time in his past five fights.

The 34-year-old Perez fought for the first time in 13½ months. England’s Luke Campbell stopped Perez in the ninth round of his previous fight, a scheduled 12-rounder in April 2017 in London.

In the second fight Saturday, light heavyweight Steve Nelson remained unbeaten by stopping DeShon Webster in the sixth and final round.

The 30-year-old Nelson, of Omaha, Nebraska, improved to 11-0 and produced his ninth knockout. Referee Russell Mora stopped their bout 46 seconds into the sixth round, with Webster still standing.

Webster protested the stoppage because he wasn’t badly hurt. He hadn’t thrown back punches as Nelson hit him with body and head shots, though.

The 27-year-old Webster, of Kansas City, Kansas, lost for the second time in his past three fights and dropped to 10-2 (6 KOs).

A stiff jab by Nelson backed Webster into the ropes early in the fifth round and forced him to hold. Nelson connected with an overhand right later in the fifth that made Webster hold.

Webster went down with a little less than a minute to go in the fifth, though the replay appeared to show Nelson pushed him down when Webster was bent over. Webster was able to get up and finish the fifth round.

An aggressive Nelson pounced on Webster at the start of the sixth round and finished him less than minute into it.

Nelson landed a hard right hand in a neutral corner early in the fourth round. Nelson continued pressing the action throughout the fourth round and a wary Webster foot off his back foot.

Israeli welterweight prospect David Kaminsky needed less than two rounds to stop Trevor Lavin in a scheduled six-rounder.

Kaminsky (2-0, 2 KOs) dropped Levin with a body shot 45 seconds into the second round. Lavin (1-1, 1 KO), of Topeka, Kansas, got to his feet, and tried his best avoid the 17-year-old southpaw’s onslaught.

He went down again, this time due to an accumulation of punches, in a corner. Referee Benjy Esteves immediately waved an end to the fight 1:12 into the second round.