The poll has become a closely-fought battle between tournament top points-scorer Flood, Andrea Masi, Fabio Semenzato and Chris Ashton.
Since the voting started on Monday, the RBS 6 Nations website has seen fans racing to nominate their chosen player.
Italy full-back Masi is ahead with 21 per cent of the votes, but Flood and Co are in hot pursuit.
The full shortlist of 12 also includes Fabio Semenzato (Italy), Sean O’Brien (Ireland), Sam Warburton (Wales), Ronan O'Gara (Ireland), Maxime Medard (France), James Haskell (England), James Hook (Wales), Tom Palmer (England) and Thierry Dusautoir (France).
Voting is open until 5pm on Monday (March 21) so there is still a great deal for all 12 to play for, especially as England chase a Grand Slam in the final round of fixtures.
Fans’ votes over the final weekend will make all the difference.
In a change from the 2010 competition, where a panel of experts selected the shortlist, all players awarded as RBS Man of the Match during the first four weekends of the 2011 Championship were automatically placed in contention for the prestigious award. The winner will be chosen by rugby fans from across the six nations who are being asked to vote for their RBS Player of the Championship, based on performance, form and achievement.
Click here to place your vote.