Sheffield United's four-match winning run came to an end as they drew 0-0 at home to Leyton Orient and slipped off the top of League One.
There was a good chance for the hosts early on when Neill Collins stabbed the ball wide from Harry Maguire's knock-down.
Blades keeper George Long then made a good save from Shaun Batt, who was through on goal, before United's Dominic Poleon fired narrowly wide.
Moses Odubajo had a shot deflected wide during a good spell for Orient, with Romain Vincelot thwarted by Long after playing a one-two with Jimmy Smith and the keeper also making a fine save to keep out David Mooney's follow-up.
United's Ryan Flynn saw an effort strike a post and Michael Doyle's firm drive was well turned over by Jamie Jones.