Lions head coach Andy Farrell accused the NSW Waratahs of dirty tricks by heavily watering the Allianz Stadium pitch prior to their error-strewn 21-10 win in Sydney.

The British and Irish Lions continue their winning run in Australia but make hard work of seeing off the Waratahs in Sydney.

The Lions scrapped their way to an 11-point victory in Sydney. But aside from scrum-half Alex Mitchell, there were few positives for coach Andy Farrell on a night when a desperate Waratahs restored pride in the blue jersey.