Our WA Men were in early trouble at 2-19 when Mitch Marsh came to the crease, but the skipper steadied the ship with a knock of 41.
Strong contributions from Marcus Stoinis (61), Josh Philippe (48),and Josh Inglis (42) ensured WA ended the day with a competitive total.
Tasmania's Jackson Bird was the pick of the bowlers with 3-51 from 21 overs.
Test hopeful Cameron Bancroft made a cautious 30 off 70 balls before Riley Meredith took a sharp catch at gully to remove the WA opener.
Mitch Marsh cracked six boundaries in his impressive 48-ball stay, and he'll be aiming to impress with the ball tomorrow.
The Tigers will resume on 0-4 for Day Two, with action getting underway at 10.30am WST.