A number of chances went to waste as Sunderland sat in their own half for most of the second half , hopeful of defending their narrow lead .
West Ham responded by piling the pressure on the Black Cats , but could not break their resolute defence .
A number of chances went to waste as Black Cats sat in Black Cats ' own half for most of the second half , hopeful of defending their narrow lead .
West Ham responded by piling the pressure on the Black Cats , but could not break their resolute defence .