Both bouts were confirmed by the UFC Canada official twitter account.
Swanson (17-5) has emerged as a potential future title challenger in recent months after back-to-back knockout wins against George Roop and Ross Pearson. The 28-year-old was pegged as an inconsistent fighter not long ago but his skills appear to be coming together at the right time. Of Swanson’s 17 professional wins, six are by knockout, seven are by submission and the remaining four are via decision.
Oliveira (16-2) is one of the youngest fighters on the UFC roster at 22, but already has an abundance of experience inside the Octagon, as UFC 152 will mark his eighth appearance in the UFC. The Brazilian has fought his last two bouts in the featherweight division and has finished both of his opponents by submission.
Miller (14-6, 1 NC) made a successful welterweight debut at UFC on FX 4 in June, submitting Ricardo Funch in the third round. Miller is 6-5 under the UFC banner with four of those wins coming by submission. The 31-year-old has never been finished in his 21-fight career.
Pierson (12-6) fights in Canada for the third time in his UFC career at UFC 152 and hopes to push his record above even as he is currently 1-1 in his home country. The Canadian rebounded from back-to-back losses with a unanimous decision victory against Jake Hecht at UFC on FX 3.
UFC 152 goes down Sept. 22 from the Air Canada Center in Toronto, Ontario, Canada. The event is headlined by a flyweight championship bout between Joseph Benavidez and Demetrious Johnson.