The Lions lead the New South Wales Waratahs 23-10 at half time at the Allianz Arena.
Tries from Jonny Sexton and Leigh Halfpenny, along with three penalties from Halfpenny, were countered with a try from 18 year old Tom Carter.
Simon Zebo had a try ruled out by the video referee, having crossed the line after just 40 seconds and with his first touch in a Lion jersey.
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