Overseas signing Marnus Labuschagne's century - his fourth of the campaign - helped Glamorgan reach 354/6 on day one after being put in by Worcestershire at Sophia Gardens.
He was supported by Nick Selman's patient 67 and an assured 97 from captain David Lloyd as the Welsh county secured four batting points.
"Especially after being put into bat, it's pleasing to see where we've got to in the game, although we let ourselves down in the last session losing two too many wickets," said Lloyd.
"That shows how far we've come since last season when we're disappointed at getting 350.
"It's nice to spend some time in the middle and contribute. I felt good after a long net on Friday doing a few technical things, and just seeing the ball and reacting on instinct.
"Marnus is incredible. He's very confident and seeing the ball well, with the hunger to keep scoring. It's nice to bat with him because he just whacks it everywhere.
"It would be nice to keep the captaincy record clean (filling in for Chris Cooke), but it'll be nice to have Cooky back after a frustrating time for him to strengthen us even more though Tom Cullen's done a fantastic job."