Chris Tremlett and Tom Curran shared nine wickets as Surrey dominated the first day of their LV= County Championship fixture with Glamorgan at Colwyn Bay.
Having won the toss and opted to bat first, Glamorgan were bowled out for 232 by their Division Two rivals in 53.4 overs.
England international Tremlett claimed 5-60 while fellow seamer Curran returned figures of 4-88, the other wicket being picked up by Matt Dunn.
Only Jim Allenby (69), Chris Cooke (45) and Will Owen (37 not out) offered any real resistance for the hosts, who then saw Surrey ease to 121 without loss in reply in the 42 overs they faced before stumps.
Glamorgan lost three wickets for one run in the opening overs; Tremlett bowled Jacques Rudolph with a delivery that nipped back and then had Ben Wright lbw playing across the line for a first-ball duck.
In between Curran had William Bragg caught at slip and after a brief break for rain, he saw off Murray Goodwin to leave the score at 43-4.
Lack of support
Cooke was trapped in front by the same bowler shortly after lunch, his counter-attacking knock having included seven fours, and although Allenby showed runs could be scored on the surface, he struggled for support.
The all-rounder lost both Mark Wallace and Ruaidri Smith in the space of five overs before becoming the eighth wicket to fall, Tremlett getting him caught by Jason Roy after he'd spent just over two hours at the crease.
Owen took over from where Allenby left off with a couple of lusty blows, yet the innings was wrapped up when Tremlett dismissed Dean Cosker and Michael Hogan to complete his five-wicket haul.
Unfortunately for Glamorgan, with the sun shining continuously since the lunch interval, Surrey made serene progress at the start of their first innings.
They reduced the deficit to 111 runs without losing a wicket, Rory Burns making an unbeaten 59 as he and opening partner Zafar Ansari (55 no) completed a dominating day for the visitors.