SEATTLE — Erica Wheeler scored 17 points, including a go-ahead shot with 18.5 seconds left, and the Seattle Storm beat the Golden State Valkyries 74-73 on Tuesday night to secure the final WNBA playoff spot.

Seattle (23-21) clinched the 20th postseason appearance in franchise history.

After Wheeler’s pull-up jumper from the free-throw line, Janelle Salaun missed a shot in the lane but she got another chance following an offensive rebound. Salaun missed a corner 3-pointer and Wheeler secured the loose ball.

Nneka Ogwumike finished with 16 points and eight rebounds, Brittney Sykes scored 14 and Skylar Diggins had 10 points and six assists for Seattle. Wheeler was 5 of 7 on 3-pointers.

Salaun had 22 points and five 3-pointers for Golden State (23-20), which became the first expansion fran

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