Dragons: Huw Anderson; Rio Dyer, Joe Westwood, Aneurin Owen, Jared Rosser; Angus O'Brien (capt), Rhodri Williams; Rodrigo Martinez, Brodie Coghlan, Chris Coleman, Joe Davies, Ryan Woodman, Dan Lydiate, Taine Basham, Aaron Wainwright.
Replacements: Elliot Dee, Aki Seiuli, Paula Latu, Nick Thomas, Shane Lewis-Hughes, Che Hope, Will Reed, Cai Evans
Cardiff: Cameron Winnett; Josh Adams, Rey Lee-Lo, Ben Thomas (capt), Gabriel Hamer-Webb; Callum Sheedy, Aled Davies; Corey Domachowski, Dafydd Hughes, Kieron Assiratti, Josh McNally, Teddy Williams, James Botham, Alex Mann, Taulupe Faletau.
Replacements: Efan Lloyd, Danny Southworth, Rhys Litterick, Seb Davies, Alun Lawrence, Ellis Bevan, Rory Jennings, Tom Bowen.
Referee: Adam Jones (WRU)
Assistant referees: Ben Breakspear & Ben Whitehouse (WRU)
TMO: Keith David (WRU)