Leigh Centurions crashed out of the Ladbrokes Challenge Cup at the fifth round stage for the second year in a row.
2015 Challenge Cup Finalists Hull KR got off to a flying start with tries by Ryan Shaw and George Lawler inside the first eight minutes.
The Centurions fought back with tries by Lachlan Burr and Curtis Naughton to level the scores.
Rovers showed a steely resolve to soak up waves of Leigh pressure and Ellis finally broke a tense second half deadlock with a drop-goal nine minutes from time.
Shaw’s second try late in the game was the icing on the cake for the 1,200 strong travelling Rovers contingent.