The UFC announced that Valerie Letourneau (6-3) had to pull out of her fight with Jessica Andrade (10-3). To replace her, The promotion has signed Larissa Pacheco (10-0) to step in. She is only 19 years old.

UFC Fight Night 51 goes down Sept. 13 at Nilson Nelson Gymnasium in Brasilia, Brazil. The event will air on the UFC Fight Pass. The main event will be Andrei Arlovski vs. Antonio Silva.

The following is the order in which the fights will take place on 9/13:

MAIN CARD – UFC Fight Pass, 8 p.m. ET
Andrei Arlovski vs. Antonio Silva
Piotr Hallmann vs. Gleison Tibau
Lukasz Sajewski vs. Leonardo Santos
Wendell Oliveira Marques vs. Santiago Ponzinibbio
Iuri Alcantara vs. Russell Doane
Jessica Andrade vs. Larissa Pacheco

PRELIMINARY CARD – UFC Fight Pass, 5:45 p.m. ET
Dashon Johnson vs. Godofredo Pepey
Igor Araujo vs. George Sullivan
Efrain Escudero vs. Francisco Trinaldo
Sean Spencer vs. Paulo Thiago
Johnny Bedford vs. Rani Yahya