This week, he called the new 25-second time rule which applies only to ATP events, not the Grand Slams "a disaster, " not so much in dry climates like the Indian Wells desert, where he is playing a bit more quickly than usual, but in hot, humid places, like Australia and the U.S. in summer.

WSJ: A Little Night Tennis, Anyone?

The humid conditions that spread rust most readily have recently been lacking in most places.

ECONOMIST: Wheat rust and world farming