Josh Cobb and Ramnaresh Sarwan put on a century partnership before Leicestershire were pegged back in their LV= County Championship Division Two clash against Worcestershire at Grace Road.
The pair put on 104, Cobb top-scoring with 63, while a last-wicket stand of 38 took Leicestershire to a total of 278 all out and a 41-run first innings lead.
Top-of-the-table Worcestershire then faced 27 overs and reached stumps on 76 for one to lead by 35 runs after day two.
Nathan Buck had opener Matt Pardoe caught at slip in the eighth over but Daryl Mitchell and Tom Fell shared an unbroken stand of 58 to put Worcestershire right back in the game.
For Leicestershire, though, it was an odd sort of day, and although they are holding their own against the division leaders they may feel they could be in an even better position.
Starting their overnight 58 for two, Greg Smith was trapped lbw by Jack Shantry in the second over of the day without addition to the total.
Cobb, with some powerful driving through the cover area, reached 50 with an even better shot - a straight six off Saeed Ajmal, and at lunch the home side looked in good shape at 156 for three.
Cobb smacked the second ball after the interval to the cover boundary to raise the century stand before the game was turned on its head in the space of five deliveries.
Cobb, attempting to run a ball from Shantry to the third-man boundary, only succeeded in providing a catch to third slip and was out for 63 off 108 balls, having hit nine fours and a six.
In the next over Sarwan top-edged a hook shot off Charlie Morris and skied a catch to deep fine-leg having made 46 off 122 balls.
It meant Leicestershire had let slip an opportunity to take a firm grip on the game and Worcestershire came back strongly, with Joe Leach bagging the wickets of Niall O'Brien and Dan Redfern - making his Leicestershire debut - as the hosts slumped to 240 for nine.
But some lusty hitting by Nathan Buck and Charlie Shreck added valuable runs and frustrated the Worcestershire attack, for whom Morris took four for 76 and Shantry three for 66.