Glamorgan 23 for 0 trail Northants 269 (Duckett 80, Newton 78, Carlson 5-28) by 246 runs
Kiran Carlson took 5 for 28 on his first-class debut to help bowl Northamptonshire out for 269 on the opening day at Wantage Road. It was a remarkable introduction for the 18-year-old offspinner from Cardiff.
Flighting the ball well and enjoying help from a dry, used wicket, Carlson - playing only due to Craig Meschede's back injury - tore through the Northants lower order. The home side collapsed in the afternoon, losing 9 for 84, although it may yet prove a heathy total.
Carlson's first wicket came as a a great relief for Glamorgan with the final ball before lunch. He broke an opening stand of 140 with a full delivery that beat Ben Duckett's sweep and took out leg stump. He returned to pick up a second wicket in the over before tea, a delivery that spun in to hit the off stump of Steven Crook.
After tea, a similar delivery bowled Rory Kleinveldt and he then induced David Murphy and Graeme White into driving to Graham Wagg at short extra-cover to complete an extraordinary debut.
Carlson finished off what was an impressive comeback from Glamorgan. The home side were in a commanding position at lunch, 140 for 1, but as some heavier cloud rolled in and the breeze picked up, batting became less straightforward. Glamorgan, to their credit, also bowled with far more discipline and took 5 for 45 in the second session.
It was Wagg who made the breakthrough in the afternoon, shaping a delivery back into the right-handed Rob Newton just enough to take an inside edge into the stumps - Newton gone for 78. Rob Keogh followed in identical fashion for just 5, with Timm van der Gugten the successful bowler.
In between those dismissals, Alex Wakely edged David Lloyd's medium pace to slip and when Saif Zaib was splendidly caught by Jacques Rudolph running back from mid-on as Zaib looked to hit Owen Morgan down the ground, Northants' ambitions of a large first-innings total were checked.
It was quite a turnaround from the morning session, when Duckett went past fifty for the sixth time this year in the County Championship, from 65 balls. Among his eight fours featured the odd moment of fortune - an early drive wide of the slip cordon and a top-edged cut over second slip - and his six was a miscued pull that flew over long leg.
Duckett's opening partner Newton made his own half-century in 81 balls but his afternoon dismissal was the beginning of Northants' collapse.