Mayer and Cameron butt heads at final face-off

Mikaela Mayer and Chantelle Cameron butted heads in their final face-off before Saturday's light-middleweight unification bout in Birmingham.WBA and WBC champion Mayer and Briton Cameron had been cordial during the build-up but tensions spilled over at Friday's weigh-in.As the pair came together to face-off at BP Pulse Arena, Cameron pushed her head into Mayer's and the American held her ground, pushing back before they ended up side-by-side and exchanging verbal insults."She isn't intimidating