15 December 2013 Last updated at 12:55 GMT

The Ashes 2013/14: Australia's bowlers exploit cracks

BBC Sport's cricket analyst Simon Hughes says Australia's bowlers exploited cracks in both the pitch and England's batting on day three of the third Ashes Test in Perth.

Using Hawkeye analysis, Hughes shows how Mitchell Johnson used widening cracks in the Waca pitch to generate lateral movement while Ryan Harris out-thought Ian Bell to take his wicket.

Australia dominated the third day's play and will start day four on 235-3 in their second innings, with a lead of 369 - tantalisingly close to an unassailable 3-0 series lead.