Originally Posted by WildVolley
You can't tell by looking at someone's physique. I used to have a similar fat level and height as Murray in that picture, and I once ran a mile in under 8 minutes - believe it or not.
A man's sprint time in the 100 meters is more relevant to tennis than the ability to run a 5K at good time. Tennis points, even at the professional level, are more like jumping rope a little and then shuttle sprinting back and forth. Distance running isn't very relevant to tennis except to the extent that it develops cardio endurance.
Pretty much this ^^^
Running times on this board sometimes goes the same ways benchpress claims are made. Having a muscular physique in no way will predict your ability in a long distance run. In fact if you were really muscular I would predict your times would not be that great because you probably didn't spend much time on cardio. I have seen a lot of fit looking guys who ran 7-9 minute miles.