UFC on FX 5 takes place October 5 from the Target Center in Minneapolis, Minnesota. The main event features heavyweights Antonio Silva and Travis Browne.
Simpson made a successful debut at welterweight last month, defeating Kenny Robertson. He is now 12-3 in his career, including a 4-1 mark in his last five fights.
Pierce (14-5) has gone 2-2 in his last four after a three-fight win streak. He topped Carlos Eduardo Rocha earlier this year.
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