Motter is batting second and playing first base Thursday, Bob Dutton of The News Tribune reports.
The rising 27-year-old had mostly batted fifth or sixth in his outings this year and had played third base the past two games while Kyle Seager (hip) was resting. Motter had two previous appearances at first base this year, and if Seattle keeps moving him around the diamond, he could boast exciting positional eligibility the rest of what could be a breakout season.