According to a story at the UFC Web site, Grove (10-4) "got drilled and dropped with a right hand by Cote."

After a series of shots to Grove's head, referee Herb Dean halted the middleweight (185 pounds) fight at 4:45 of the opening round.

In the main event, Randy Couture defeated Gabriel Gonzaga by a third-round TKO to retain his heavyweight championship.

Couture, 44, never had his back on the floor, won at 1:37 and upped his record to 16-8.

Gonzaga's nose was broken late in the first, and Couture dominated the second round. He backed the 28-year-old Gonzaga (8-2) against the fence for much of the period.

In the second biggest match of the night, Georges St-Pierre won by unanimous decision over Josh Koscheck in a welterweight bout.

"I've just been reborn now," said St-Pierre, referring to his TKO loss in the first round to Matt Serra on April 7 in Houston. "I'm better than ever. Josh is a great wrestler. My plan was to put him out of his comfort zone."

St-Pierre dominated the match, putting Koscheck on his back for much of the first period and most of the second. St-Pierre also got Koscheck on his back in the late stages of the third. Koscheck (11-2), from Fresno, Calif., only had St-Pierre on his back during the late stages of the first period.

St-Pierre, out of Montreal, improved to 14-2.

Also on the main card, Roger Huerta won by TKO in the third round at 1:50 over Alberto Crane in a lightweight bout. Huerta, from Minneapolis, dominated the fight and moved his record to 21-1-1, while Crane, from Glendale, Calif., fell to 8-2.

Lightweight Joe Stevenson, from Las Vegas, won an unanimous decision over Kurt Pellegrino, from Jupiter, Fla.

In the prelims, Renato Sobral defeated David Heath at 3:30 of the second round. For much of the lightweight match, Heath was on his back and bloodied by a cut on his forehead.

Frank Mir beat Antoni Hardonk by submission during the first round in a heavyweight bout. Tales Leites got Ryan Jensen to tap out at 3:47 of the first period in a middleweight bout. Clay Guida won by decision over Marcus Aurello, 30-27 in a lightweight match.