SEATTLE (AP) — Patrick Corbin tossed seven shutout innings, Washington jumped on Seattle starter Logan Gilbert for three first-inning runs, and the Nationals won another series with a 4-1 win over the Mariners. Washington picked up another unexpected series victory and added another layer to the growing frustration of Seattle’s underperforming season. The Nationals took two of three against the Mariners after doing the same in San Diego last weekend. Corbin was terrific with a performance that was more reminiscent of earlier in his career. For the first time in 17 starts this season, Corbin didn’t allow an earned run — and his nine strikeouts were a season high.