THE Dons suffered their first back-to-back defeats of the season after they went down at Whitehaven.
Tony Miller’s men were hoping to bounce back from a 24-8 home defeat to Rochdale a fortnight ago.
But despite a spirited showing they came up short against another one of the title favourites.
Kyle Kesik’s 24th minute try, goaled by Scott Spaven, got Doncaster on the board after falling behind to early scores from Chris Smith and Paul Cullnean.
Lewis Palfrey, who kicked five goals, went over just before the break to give Whitehaven an 18-6 advantage at the break.
Palfrey kicked a penalty before Dean Colton reduced the deficit with a Spaven-converted try on the hour mark, but just minutes later the Dons allowed Tyrone Dalton to cross the line.
Ryan Steen’s last minute try was a mere consolation as Doncaster failed to pick up a losing bonus point.