Charlton wrapped up the npower League One title with a 2-1 victory over Wycombe, but the fight for the second automatic promotion spot will go into another week after differing fortunes for the two Sheffield clubs.
The Addicks had already ensured they would be playing Championship football next term, but opened up an unassailable nine-point gap at the top with Saturday's win. Yann Kermorgant fired Charlton in front after 13 minutes and, although Stuart Beavon replied before half-time, Dale Stephens sealed the points in the 75th minute.
Sheffield United remain second in the table but now sit just one point ahead of city rivals Wednesday following a 1-0 loss at MK Dons. Alan Smith scored the only goal after 15 minutes, while the Owls snatched a last-gasp 2-1 victory over Carlisle courtesy of Michail Antonio's strike.
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