A comfortable win for the development squad aided by the experience of Gary Madine and Lee Tomlin.
After missing the first team trip to North America through visa issues, both Gary Madine and Lee Tomlin have stepped up to prove themselves while on tour with the U23's.
At Tavistock on Monday night Madine scored a hat trick inside 30 minutes with Tomlin setting up two of them, Tomlin then scored himself as City led 5 - 0 at half time.
Two more goals followed in the season half and City ran out 7 - 0 winners.
Next up the U23's face Bodmin on Wednesday.
AFC Tavistock: Josh Oak,Rhys Shapley, Dan Evans, Matt David, Josh Robins, Jack Craigo, Jack Hallett, Warren Daw, Tallan Burns, Lee Coombes, Dan Viall. Subs: Jamie Hinds, Harry Dwelly, Gino Garside, Brandon Roberts, Parnell, Luke Brown.
Cardiff City: Alex Smithies, Joel Bagan, Trystan Jones, Ben Margetson, William Warnock, Keenan Patten, Kieran Evans, Shamar Moore, Tom Sang, Jacob Evans, Lee Tomlin, Gary Madine. Subs, all used: Ryan Pryce, Matthew Hall (gk), Sam Bowen, Laurence Wootton, Dan Griffiths, Dan Williams, Conor Davies, Jack Davies.
Referee: Mark Walley.