Leyton Orient moved top of League One after coming from behind in a thrilling draw with struggling Sheffield United.
David Mooney twice came close to giving the O's the lead, scuffing a shot wide before forcing keeper George Long into a fine save from Shaun Batt's cross.
The Blades grew into the game and were ahead when Chris Porter teed up Conor Coady to fire them in front.
O's still waiting
The result means Leyton Orient have still not beaten Sheffield United since 1983
But Dean Cox volleyed into the top corner from outside the box to level and put the O's top after
The O's almost snatched a dramatic injury-time winner but Robbie Simpson and Mooney both saw headers kept out by Long.
However, as Kenny Jackett's side suffered a 1-0 defeat at the hands of fellow promotion-chasers Peterborough, Orient moved above their closest rivals by virtue of goal difference.
There will be cause for concern, though, as an injury kept in-form veteran striker Kevin Lisbie out of the visit of Nigel Clough's side, who moved out of the relegation zone with the point.
VIEW FROM THE DRESSING ROOM
Sheffield United boss Nigel Clough told BBC Radio Sheffield:
"It was all going according to plan and another screamer has denied us all three points.
"The balls just dropped and he's hit - it's a great strike.
"I thought the back four - and especially the goalkeeper - was outstanding and kept us in the game in the first half."
Leyton Orient 01 Jones 05 Cuthbert (Simpson - 72' ) 02 Omozusi 04 Vincelot Booked (Bartley - 88' ) 06 Baudry 15 Clarke Booked 11 Odubajo 08 James (Wright - 69' ) 14 Batt 10 Mooney 07 Cox Substitutes 03 Sawyer 12 Larkins 19 Lasimant 20 Gorman 21 Bartley 24 Wright 25 Simpson Sheffield United 25 Long 29 McMahon Booked 06 Hill 08 Doyle Booked 05 Maguire Booked 15 Collins 17 Coady 14 McGinn 11 Baxter (Murphy - 85' ) 09 Porter (Taylor - 79' ) 04 White (Lappin - 72' ) Substitutes 01 Howard 10 Taylor 12 Miller 16 Cuvelier 18 King 22 Lappin 23 Murphy
Ref: Darren Deadman