West Indian batsman Chesney Hughes hit his highest first-class score as Derbyshire enjoyed a productive first day in their LV= County Championship Division One match against Yorkshire.
The 22-year-old clubbed 25 fours and three sixes on his way to 171 not out at Headingley, beating his previous best of 167.
He batted through the day and faced 282 balls to steer Derbyshire to 302 for four, a promising position after a rain-delayed start to proceedings.
England seamer Tim Bresnan had started well for the White Rose, having Billy Godleman caught for two by international team-mate Joe Root, but Hughes and Wayne Madsen (93) put on 158 before the next wicket fell.
Adil Rasid raised Yorkshire spirits when he dismissed West Indies star Shivnarine Chanderpaul for four, but there was no doubting whose day it was.
Sheffield batsman Root, meanwhile, will captain England Lions in their tour match against New Zealand next month. He is all but guaranteed a starting spot in the subsequent Test series agains the Black Caps but he is viewed as a potential England skipper of the future and the selectors are keen to give him leadership experience.