Time Travel Tennis: who would you like today's players to play?
Suppose you finally built a working time machine, and you could travel back to any year and bring a player to the present to face one of today's players. Who would you bring to face whom? Perhaps we could assume that the past players would be given the modern equipment, and some time to familiarize themselves with it. And forget for a moment any debates about which great players are better than which. This is purely for your personal enjoyment-- matches that you would want to see. You could pit greats against the likes of Henin, or not-so-greats against the likes of Loeffler-Caro, or anything in between.
Theoretically, if you had the time machine, you could also put two past players against each other, but variations of that topic have been done. So let's say, due to failsafes built into the space/time continuim, that only one past player could be transported at a time, and would have to face a current player.
Who would you bring, and who would you have them play?