Burton extended their lead at the top of Sky Bet League One with a comfortable 3-1 win over Bradford.Derby loanee Mason Bennett scored on his full debut and victory for Nigel Clough's men was sealed by second-half goals from Tom Naylor and Mark Duffy.Burton could have been in front early on but Lucas Akins skied a gilt-edged chance, before Duffy was denied by City keeper Ben Williams.The hosts had to wait only until the 17th minute for the opener, with former Bradford loanee Bennett's 12-yard shot deflected past Williams.James Hanson could have levelled 10 minutes later but steered his angled shot wide.After the break, Hanson had a header comfortably saved and saw another loop over the crossbar before Burton tightened their grip.Naylor met Damien McCrory's cross with a first-time shot that bounced in off the underside of the bar in the 73rd minute.Four minutes later, Duffy was on hand to turn home Stuart Beavon's cross.Rory McArdle headed a consolation goal for Bradford from Tony McMahon's corner in added time.