UFC lightweight champ Frankie Edgar topped BJ Penn on Saturday in the main event of UFC 118, while Randy Couture, Gray Maynard, Demian Maia, and Nate Diaz also scored wins at the UFC’s Boston debut.

The official UFC 118 results are:

MAIN CARD

• Champ Frankie Edgar def. BJ Penn via unanimous decision (50-45, 50-45, 50-45)
  UFC Lightweight Championship
• Randy Couture def. James Toney via submission (arm triangle choke) – Round 1, 3:19
• Demian Maia def. Mario Miranda via unanimous decision (30-27, 30-27, 30-27)
• Gray Maynard def. Kenny Florian via unanimous decision (30-27, 30-27, 29-28)
• Nate Diaz def. Marcus Davis via technical submission (guillotine choke) – Round 3, 4:02

PRELIMINARY CARD

• Joe Lauzon def. Gabe Ruediger via submission (armbar) – Round 1, 2:01
• Nik Lentz def. Andre Winner via unanimous decision (30-27, 29-28, 30-27)
• Dan Miller def. John Salter via submission (anaconda choke) – Round 2, 1:53
• Greg Soto def. Nick Osipczak via unanimous decision (29-28, 29-28, 29-28)
• Mike Pierce def. Amilcar Alves via submission (armbar) – Round 3, 3:11

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Pictured: Frankie Edgar and BJ Penn