Watch UFC 101 Replay Video

B.J. Penn showed once again on Saturday night that he's the best lightweight in mixed martial arts, defending his UFC title and defeating Kenny Florian with a fourth-round rear-naked choke at UFC 101.

Penn controlled the fight throughout, winning the first three rounds before submitting Florian in the fourth.

UFC middleweight champion Anderson Silva remained undefeated in the Octagon Saturday night, moving up to light heavyweight and destroying former champ Forrest Griffin, hardly even breaking a sweat before beating Griffin by first-round TKO.

After they felt each other out for the first couple of minutes, Silva landed a powerful right punch that leveled Griffin. He let Griffin up and leveled him again, then did it a third time before the referee stopped the fight.

Results:
Jesse Lennox beat Danillo Villefort by third-round TKO (cut)
George Sotiropoulos beat George Roop by second-round submission (kimura)
Matt Riddle beat Dan Cramer by unanimous decision
Alessio Sakara beat Thales Leites by split decision
John Howard beat Tamdan McCrory by split decision.
Kurt Pellegrino beat Josh Neer by unanimous decision.
Ricardo Almeida beat Kendall Grove by unanimous decision
Johny Hendricks beat Amir Sadollah by first-round TKO (punches)
Aaron Riley beat Shane Nelson by unanimous decision
Anderson Silva beat Forrest Griffin by first-round TKO (punches)
BJ Penn beat Kenny Florian by fourth-round submission (rear-naked).