4.6 mile in 55 min

Since I biked home yesterday, I ran to work this morning. Getting up a little bit late, I started to run around 10:20. I ran first mile as warmup. Then I walked 0.1 mile since I feel some pain in my right shin, which I suspect as MTSS. I walked and the symptom did not go away. I then started to run again. after about another mile or so, it had gone. I ran in a pretty slow and easy pace for about 3.6 mile and stopped myself and the timer. I walked the rest way to my office (about 0.1 mile) to cool down. It was a nice easy run.
I played tennis for a while in the evening. I want to choose a tennis racquet and got two for demo. I haven't decide yet.