Glamorgan 390 (Carlson 162) and 159 for 4 (de Leede 3-25) trail Durham 630 (Lees 62, Bedingham 151, Robinson 102, Clark 80, de Leede 85*) by 81 runs

The Netherlands international then took centre stage with the ball, striking with his first two deliveries before adding a third to end the day with figures of 3 for 25 to leave Glamorgan four down at the close, still requiring 81 runs to make Durham bat again.

Durham began the day with a lead of 21, and Bedingham added another milestone to his collection by working his way past 150. But, he would fall from the following delivery knicking off to James Harris to end a partnership worth 149 with Graham Clark.

Clark added only 12 to his overnight score as he lacked the fluency to kick on for his second first-class hundred in a row, although the tail would ensure that Durham's dominance of the scoreboard continued.

De Leede helped his team turn the screw with a patient knock for his third first-class fifty, securing a career-best score of 85, including six fours and a six that Timm van der Gugten could not keep in play on the rope.

Ben Raine, Ajaz Patel and Craig Miles all made double figures to frustrate the visitors, who were forced to scatter the field against the latter amid an onslaught of runs in the afternoon sun. Miles blasted two sixes in the final stand with de Leede worth 62, lifting Durham to their fifth-highest first-class score of 630 and a lead of 240. After dropping Miles twice, Gorvin got the final wicket to end four-and-a-half sessions of toil for the visitors.

Glamorgan required a solid start from their makeshift openers Zain ul-Hassan and Andrew Salter. The two batters were solid and added a second partnership over fifty for the first wicket.

Stanley McAlindon endured a tough time in the field in the first innings, and his luck was out again from his first ball after finding Zain's outside edge, only for the ball to travel through the vacant second slip position. But McAlindon was rewarded for his efforts with the first wicket as he found Zain's top edge and Ollie Robinson took a fine diving catch.

De Leede then turned up the pressure with two wickets from his first two deliveries. Ingram picked out Bedingham at gully with a loose shot before de Leede pinned Sam Northeast lbw. Kiran Carlson survived the hat-trick ball, but de Leede's impressive spell continued when he sent Salter's stumps flying for 48.

Carlson's resistance continued until the close alongside Billy Root, although the Glamorgan skipper and his team have a huge task ahead of them to avoid their first defeat of the season.