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Sy Bean, AP
Seattle's Clint Dempsey (2) waives to the crowd after scoring his second goal off an assist from Obafemi Martins (9) during the Sounder's regular-season finale as they play Real Salt Lake to decide if they will enter the playoffs, at CenturyLink Field, Oct. 25, 2015, in Seattle, Wash. The Sounders won, 3-1. (Sy Bean/The Seattle Times via AP)

SEATTLE — Clint Dempsey scored two goals and assisted on another, all in the first 20 minutes, and Seattle beat Real Salt Lake to wrap up a playoff berth.

The Sounders (15-13-6) ended the regular season on an eight-game unbeaten streak (4-0-4). They have made the playoffs in all seven years of their existence.

Dempsey put the Sounders on the board in the fifth minute when he met a cross from Obafemi Martins at the top right corner of the 6-yard box and sent it into the net while falling to the turf. It was his ninth goal of the year. Marco Pappa scored in the 10th minute off of a cross from Dempsey. In the 20th Dempsey made it 3-0 when he buried the rebound of a hard shot by Martins.

Luis Gill scored in the 77th minute for Salt Lake (11-15-8).