In other results on SHOWTIME, southpaw Joe "The Diesel" Riggs registered a unanimous decision over Phil Baroni in a welterweight scrap and "Iron" Mike Whitehead scored the biggest victory of his career with a unanimous decision over comebacking former UFC standout and two-time NCAA Division I national wrestling champion Kevin Randleman in a light heavyweight bout.

The event, presented by SHOWTIME and STRIKEFORCE, aired live simultaneously on SHOWTIME and on the Web (Strikeforce: All Access) at http://strikeforce.sho.com. The SHOWTIME telecast aired at 10 p.m. ET/PT (delayed on the west coast); the Strikeforce: All Access webcast went at 10 p.m. ET/7 p.m. PT and is available through Tuesday, June 9, at the site.

It was announced during the SHOWTIME telecast that the biggest fight in the history of women's MMA, the long-awaited, eagerly anticipated match between superstars Gina Carano and Cris "Cyborg" would take place on Saturday, Aug. 15, at the HP Pavilion in San Jose, Calif., on SHOWTIME.

Also on Aug. 15, Josh Thomson will defend his Strikeforce lightweight title against former belt-holder and interim champ Gilbert Melendez and STRIKEFORCE heavyweight champion Alistair Overeem will defend against an opponent to be announced.

San Francisco's Shields (23-4-1), the grappler moving up in weight, forced the slugger, Lawler (16-5, 1 NC), of nearby Granite City, Ill., to tap out at 2:02 of the opening round from a guillotine choke. The defeat ended a six-fight unbeaten streak (5-0, 1 NC) for Lawler.

"This was a great fight and I thank Robbie for the opportunity," said Shields, who, along with Diaz, is a Cesar Gracie Brazilian Jiu-Jitsu black belt. "He is a great fighter but this was just my night."

Rogers' victory, while perhaps not totally unexpected, figures to have the fans talking for a long time. After missing with his first punch, a right hook, Rogers (10-0), of St. Paul, Minn., landed a flush left hook, a right and another left hook that sent Arlovski (15-7), of Chicago, crumbling to the canvas. The referee stepped in and halted the proceedings immediately.

"I've always said that I can hurt people with my power and I proved it again tonight," Rogers said. "Hopefully, this fight will get me into the top 10. Once, I touch you it is over. I will fight anybody."

Diaz (20-7), of Stockton, Calif., mostly dominated Smith (17-6, 1 NC) of Elk Grove, Calif. Diaz, who was coming off an easy victory over Frank Shamrock in April, seemed to do as he pleased for the most part. He out-punched the puncher, hurting Smith on numerous occasions. Known for miraculous comebacks, Smith had no answer on this night, going down twice, the last time from body shots.

"I'm not sure who I'll fight next or if it is at 160, 170 or 180," said Diaz after the fight was stopped at 3:38 of the third. "But I am happy with this fight."

Riggs (30-10), of Phoenix, Ariz., won by the scores of 30-27 on the three judges' scorecards. After managing to bottle up Baroni and take the first two rounds, Riggs, despite two broken hands, dominated the third. "I want to fight Jake Shields," Riggs said afterward.

Baroni (13-11) of Las Vegas by way of Long Island, NY, had a three fight winning streak end.

In the telecast's opening bout, Whitehead (24-7), of Las Vegas, outpointed Randleman (17-13) of Las Vegas by the scores of 29-28 three times. It was the second straight victory for Whitehead, who is 15-1 in his last 16 fights. Randleman was fighting for first time since May 2008 and only the second time since October 2006.  Close