Wander
Hall of Fame
Jeff's data proves that - as most fans have observed over the past decades - pro tennis has developed to a direction where surface makes less of a difference to the players' tactics and average rally length etc. than it used to in the 80s and before.
Jeff's hypothesis is that this is due to a combination of actual changes to the surfaces and the changes to the rackets and strings - and he thinks the development of the equipment plays the larger role in this convergence although this is difficult to prove with data alone.
Seems pretty uncontroversial to me, but an interesting article nonetheless, and always good to see some numbers to show the difference!