NEW YORK -- Major League Baseball is having its most-viewed postseason in the United States in 15 years.

Viewership is averaging 4.33 million through the division series, according to MLB and Nielsen, a 30% increase over last year and the best since 2010.

Last Friday's 15-inning thriller between the Seattle Mariners and Detroit Tigers averaged 8.72 million viewers on Fox, Fox Deportes and streaming. The Mariners' 3-2 victory in the fifth and deciding game of the AL Division Series was the most-watched division round game on Fox since Detroit's Game 5 win over the New York Yankees in 2011 averaged 9.72 million.

The two AL Division Series on Fox, FS1 and FS2 averaged 4.15 million, the most-watched division round on any network since the NL Division Series on TBS (Cubs-Cardinals and

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