Lian Wharton took three wickets for Derbyshire

Glamorgan needed to make a solid start if they had any chance of saving the game, but they suffered a pre-lunch blow in the sixth over when Hemp edged a Kevin Dean delivery to Cork.

Derbyshire struck again soon after lunch when Cork defeated Adrian Dale for pace and Glamorgan were struggling on 39 for two.

Opener Steve James, so often a rock at the top of the Glamorgan batting line-up, gained confidence as the match progressed and gained good support from Michael Powell.

The partnership was worth 63 when Lian Wharton trapped Powell lbw with a good-length ball.

The experienced Matthew Maynard replaced Powell but he only managed six runs before edging a ball from Cork onto his stumps.

England star Robert Croft followed Maynard back to the pavilion in the next over, edging a Wharton delivery to Cork.

Glamorgan's hopes rested firmly with James, who continued to keep the scoreboard ticking over, but his brave stand came to end on 78 when he was adjudged lbw while attempting to sweep Wharton.

Thomas offered brief resistance before Luke Sutton took a sharp catch to leave the hosts reeling at 206 for seven.

However, Wallace (84 not out) and Australian Kasprowicz (32 not out) added an unbroken 75 for the eighth wicket to take the match into a fourth day.

Glamorgan: S P James (Capt), D L Hemp, A Dale, M J Powell, M P Maynard, R D B Croft, M A Wallace (Wkt), S D Thomas, M S Kasprowicz, S P Jones, D A Cosker.

Derbyshire: S D Stubbings, A I Gait, M J Di Venuto, D R Hewson, L D Sutton, D G Cork (Capt), K M Krikken (Wkt), J I D Kerr, G Welch, K J Dean, L J Wharton.