While the number was still higher than Strictly Come Dancing on BBC One - which averaged 9.4 million - it was around 2 million down on the equivalent X-Factor show last year.
In addition, Strictly attracted more viewers than X-Factor during the 15 minutes in which the two shows went head-to-head.
Saturday's X-Factor was a "rock" special, with contestants performing songs from acts including from Bon Jovi, The Darkness and Guns 'N' Roses. Next week's X-Factor shows will have a ...
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