Hundreds from Eddie Byrom (144) and Sam Northeast (105*) put Glamorgan in the driving seat as they set Nottinghamshire 455 to win in 105 overs after dominating day three of their LV= County Championship clash at Sophia Gardens.
Byrom's century was his second in three LV= County Championship matches, while Northeast recorded his first hundred for the Welsh county.
"A very good day, great to capitalise on that session we had last night (taking six wickets for 30), and it gives us a really good chance," said Byrom.
"To share that stand with Lloydy was special, an absolute pleasure to be out there with him, and nice for me to get a few scores together, I'm feeling pretty good with my batting.
"It was very special to see Sam's hundred, he played really well and put them under a lot of pressure from the get-go and you could see how dejected they were by the end, physically and mentally that's going to play a big part.
"(Notts tactics) showed how much in the ascendancy we were, we didn't want to declare too early and give them any chance. We've done so well to be in the position we are, that we buried them today."