His blast backed Matt Harrison (13-9), who tossed 6 2/3 scoreless innings, during which he gave up six hits, walked two and struck out nine as the American League West-leading Rangers won the three-game series.
With the win, Harrison became the fifth Rangers pitcher with 13 victories this year -- a first in club history.
Elvis Andrus extended his hitting streak to 12 games with a 3-for-5 performance that included a run-scoring double.
Seattle's Felix Hernandez (14-13) was touched for three runs on nine hits over seven innings.
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