Aussie Mark Cosgrove became just the fifth Glamorgan Championship debutant to score a century, in reply to Derbyshire's 335 at Sophia Gardens.

Cosgrave hit a run-a-ball 114, with 98 scored in boundaries, sharing a 105-run third-wicket stand with Mike Powell.

The patient Powell fell for 100 before stumps, Glamorgan reaching 296-6.

Earlier Derbyshire, who lost six wickets for 21 runs on day one, added 60 for their last three wickets, with Mo Sheikh hitting a doughty 36 not out.

But the visitors' cause was not helped by wicket-keeper James Pipe breaking the middle finger on his right hand while attempting to take a ball from behind the stumps.

He is unlikely to bat in the second innings but Glamorgan have sanctioned a replacement keeper with Lee Goddard being summoned from Derby.