What are examples of tactical revolutions in sport? (i.e Baseball's "Opener", NBA's "Seven seconds or less")

There's a fascinating tactical experiment happening in baseball right now where a relief pitcher is coming into the game during the first inning, instead of the typical 8th/9th inning. More details here: http://www.espn.com/mlb/story/_/id/23558800/tampa-bay-rays-forefront-rotation-revolution

It reminds me of the tactical strategy used by the Phoenix Suns' "Seven Seconds or Less" in the early 2000's. The impact of that strategy now has a long lasting impacting on today's current NBA. Other NBA strategies are Sam Hinkie's tanking strategy for accumulating draft picks, and Tex Winter's triangle offense.

I'm curious to know what are some other smart tactical strategies that shifted their respective sports. Thanks

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