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Continue to ChatThe grass is a very big challenge for me. There are these low bounces and different movements, which is very difficult, especially for my height and weight. When the surfaces change, and I start to play on grass, I start to feel it in the lower back and the lower hamstring. - Tomas Berdych from https://whatsmyquote.com/quote/the-grass-is-a-very-big-challenge-for-me-there-are-these-low-bounces-and-different-movements-which-is-very