The rules also say Grand Slams must provide sawdust for players (as well as water, electrolyte drinks, cups, and towels). The sawdust is for sweaty palms and Ivan Lendl was such a fan of the stuff, he used to keep some in his pocket while playing. … What’s more, sweating is not a good enough reason for a code violation.
Then, what did Ivan Lendl keep in his pocket?
Ivan Lendl wore a funny hat and carried sawdust in his pockets.