: I can run better after swimming, how come? I found out that when I go swimming in the evening (from 5:30 - 6:30), that my running (from 8:30 - 9:30) seems to go a lot better. (Eg. I'm less tired, I have less need for stretching

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I think it's because the overall temp of the body has dropped, and hence it takes longer to heat up and then you sweat less and dont dehydrate as quick.
I'm doing a 8k race tomorrow and will have a swim first, just for 15 min...

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Several factors are involved:

Your body warmed up enough --> thus less need for stretching
Swimming actually regulates your breathing system, it is like some sort of "heavy" yoga breathing session, specially if you "crawl" or do "Butterfly Stroke" which both require some time below water and thus deep breathing when above water to recuperate. Thus you breath much better and sharper after a swimming session ---> breathing is needed while running, so you already got the boost from swimming
You are either having a balanced diet | or enough calories for energy | or in case you have fat reserves that will be fueling your energy for running after swimming (After one hour of swimming, if you did not load yourself during the day with calories, your body must be already getting energy from fat reserves and it continues to do that when u go run).
In each of these cases , you already have some energy left to burn for running.

The 3 factors mentioned put you in a "good" state for running. PS: make sure you dry well after swimming before running specially if you live on the beach, night sea winds are fresh and if you didn't dry well you might get sore muscles the next day.