I watched a good amount of most of tennis' grand slams from about 2000 through 2013 or so. I was a Roger Federer fan, and for a good chunk of that period, you could always count on Mr. Federer playing late into the Slam (he had a record 23 consecutive Semifinals appearances from Wimbledon 2004 through the Australian Open 2010, and 36 consecutive quarterfinal appearances from the same starting…