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Continue to ChatThe Grass is Slowing: Another Look at Surface Speed Convergence http://www.tennisabstract.com/blog/2016/06/11/the-grass-is-slowing-another-look-at-surface-speed-convergence/
The Grass is Slowing: Another Look at Surface Speed Convergence http://www.tennisabstract.com/blog/2016/06/11/the-grass-is-slowing-another-look-at-surface-speed-convergence/