Tom Wells scored his second hundred in a week to guide Leicestershire Seconds into a position of strength against Durham.
Wells, who hit a blistering ton against Lancashire in the Trophy at Lutterworth, posted 132 not out in the Championship game at Darlington as County closed on 235-2 on a rain-reduced day.
The all-rounder shared 162 for the second wicket with Angus Robson (57, 153b), who posted another half-century in a consistent season.
A breakfast-time monsoon left the ground saturated and after a couple of inspections, the umpires decided to start at 2.30pm. Captain Nathan Buck won the toss and elected to bat first.
Karl Turner (4) was an early casualty as Ruel Brathwaite struck but Wells moved to 50 from just 47 balls with nine fours. Robson was on 23 (54b) at that stage with the score on 79-1.
The duo took the total to 145-1 at tea, by which time Wells was on 88 (99b) and Robson 42 (118b). The duo reached their milestones after the interval, with Robson's half-century including eight fours from 133 deliveries and Wells' hundred being registered from 121 balls with 13 fours and a brace of maximums.
Durham's spinners had helped to slow the rate and Robson fell lbw to slow left armer David Foster. Harry Bush (28*, 52b), kept the scoreboard ticking alongside Wells. The score was 214-2 when players left the field for bad light, but they returned for eight more overs and added a further 21 runs.
Bowling figures for Durham: Brathwaite 11-1-42-1, Harrison 5-1-22-0, Arshad 7-1-33-0. Ireland 5-1-23-0, Morley 14-3-35-0, Foster 17-1-46-1, Jennings 5-2-7-0, Parker 4-0-15-0.