Dave Chisnall stuns Michael Van Gerwen to book semi-final spot

Dave Chisnall (left) is through to the PDC World Championship semi-finals for the first time following his victory over Michael Van Gerwen (right) (John Walton/PA).
Dave Chisnall (left) is through to the PDC World Championship semi-finals for the first time following his victory over Michael Van Gerwen (right) (John Walton/PA).