But the Australian expects he could keep Vettel behind him in the race nonetheless.
Daniel Ricciardo will start from 15th thanks to another Renault engine failure.
Daniel Ricciardo is at a loss to explain how he fell so far off the pace in qualifying for the Singapore Grand Prix.
Daniel Ricciardo reckons he'll be in the mix this weekend.
Daniel Ricciardo will leave Red Bull Racing at the end of the season.
Daniel Ricciardo's unexpected Renault switch has thrown the driver market into disarray.
Daniel Ricciardo's Renault switch seems risky, but it's based on some sound reasoning.
Daniel Ricciardo has dropped the driver market bombshell of the season.
Faster cars aren't the answer to F1's problems.
Daniel Ricciardo is out of options for 2019.
Red Bull Racing says it's losing bucketloads of time on the straights.
Daniel Ricciardo and Red Bull Racing remain outside chances at best of claiming either title in 2018.
Are Red Bull Racing's qualifying antics a sign of favouritism? Don't bet on it.
Daniel Ricciardo is the driver market's hottest property. Could he be bound for one of F1's slowest teams?
Daniel Ricciardo would be foolish to take up McLaren's offer.
Put simply Monaco isn't like other races, and it isn't supposed to be.
Daniel Ricciardo claimed back his lost 2016 Monaco Grand Prix victory with a gutsy win in Monte Carlo.
A partial power unit failure wasn't going postpone Ricciardo's Monaco redemption.