Overview:UFC on Fox 15: Machida vs. Rockhold was a mixed martial arts event held on April 18, 2015, at the Prudential Center in Newark, New Jersey. The event was the sixth event that the UFC has hosted in Newark, New Jersey and was headlined by a middleweight bout between former UFC Light Heavyweight champion Lyoto Machida and former Strikeforce Middleweight champion Luke Rockhold.