Why Wimbledon's grass is so tricky

• Balls bounce faster, lower and with less predictability on grass. That's why players with the best racket skills tend to perform well at the All England Club.
• Rafael Nadal's patented topspin shot is less effective with Wimbledon's deadened bounces, whereas shots like Roger Federer's slicing backhand reign supreme.

Yes, but: As the tournament's second week continues in London, that once-pristine grass has turned dry and the soil beneath it has hardened.

• Returning players have a distinct advantage on this "new" surface: They're experienced in dealing with the grass as it turns to dust and dirt, tennis analytics pioneer Craig O'Shannessy tells NYT.
• The second-week grass also produces higher bounces that make topspin even more effective, which is good news for Nadal: He's in the quarters for just the third time since 2011.