He has n't been able to keep Pettis flat on the mat .
He 's managed to grind Pettis to the fence , constantly force Pettis to defend the takedown and has been able to land his own punches as a result .
He has n't been able to keep Pettis flat on the mat , but he 's managed to grind him to the fence , constantly force him to defend the takedown and has been able to land his own punches as a result .