UFC 186: Johnson vs. Horiguchi was a mixed martial arts event held on April 25, 2015, at the Bell Centre in Montreal, Quebec, Canada.

[6] A welterweight bout between Rory MacDonald and Héctor Lombard was expected to take place at the event.

[8] Subsequently, it was announced that MacDonald would receive a title shot against current champion Robbie Lawler at UFC 189.

However, on April 1, it was announced that Trujillo had pulled out of the fight due to a broken arm and was replaced by promotional newcomer Shane Campbell.

[11] Former UFC Light Heavyweight champion Quinton Jackson was expected to make his promotional return against Fábio Maldonado at the co-main event.