The 23-year-old, making his 75th league appearance for the newly promoted Welsh side, received a match-best rating of 8.6 out of 10 on Flashscore's player ratings algorithm.
Cardiff were favourites to win the match against mid-table Stoke and, despite briefly escaping the relegation zone with their fourth point of the season, remain one of just two EFL Championship clubs (alongside Burnley) yet to win this season.
The Bluebirds are in for a tough fight as a newly promoted club, but more all-round performances such as this from their young Socceroos midfielder will certainly help them scrap for more points.
Robertson topped several key stat counts for both sides in both attack and defence, recording more accurate passes in the final third (27) than anyone else, as well as a game-best six key passes, two big chances created and even winning all three of his individual duels entered into.
There were four other Aussies in action during the EFL Cup Round of 32, albeit with far less success.
19-year-old Lucas Herrington has spent just 76 Premier League minutes on the pitch for new club Hull City, but has been a 90-minute starter in each of their EFL Cup matches so far.
Hull's run in the competition came to an end on Wednesday morning when they lost 1-0 away to Sunderland, with Herrington rating just 6.0 out of 10 after losing five of his eight duels and registering only one interception and three clearances.
Bradford City's Hayden Matthews made his first competitive appearance of the season, officially becoming player number 1408 for the Bantams after playing out 60 minutes in their 3-1 win away to Leyton Orient.
Matthews was the sixth-best rated player on the pitch with 7.6 out of 10, winning five of his seven duels, clearing the ball five times, blocking two shots and making four interceptions - one behind Idris El Mizouni's five.
Lincoln City pairing Joe Gauci and Callum Elder had an even tougher EFL Cup trip to Premier League side Bournemouth than expected.
They were projected by modelling to lose 2-0, and that score looked to be right on track before a late-game blowout that saw the Cherries double their score beyond the 85-minute mark.
Gauci saved four of the eight shots that came his way, rating just 5.3 out of 10, whilst starting left-back Elder was booked, passed at only 61% accuracy and lost three of five individual duels. One to quickly forget for both of them.
Aaron Murphy has been with Flashscore since 2018 and, as the founding editor of the Australian newsdesk, has reported on-site at several major events in Melbourne including the Australian Open, State of Origin, A-League, NBL and international cricket. You can read his pieces here and contact him on X or LinkedIn.
