There's been over 70 studies showing that stretching is useless and even harmful to performance.
They cover almost everything, from pure measure of strength to actual performance.
They've tested it with sprint, power, and endurance.
They've tested 15sec stretches, 30sec stretches. They've tested how many stretches it takes and in as little as 1 stretch there's diminished work capacity.
Stretching is useless before competition.
And it makes sense. In distance running it's all about muscle stiffness. Elastic energy and return. A stiff spring is much better.
Warm up with easy jogging, strides, and some dynamic work.
Or if you want decreased performance, stretch.
Dynamic flexibility is much different than static flexibility.
As long as you can get through your Range of motion, why do you need more?
While we are at it, no studies have shown that stretching helps with injury prevention. There's been studies to show that stretching does not alleviate muscle soreness, nor does it help Delayed onset muscle soreness.
To conclude, stretching is worth about as much as most distance runners intuitively knew, nothing. Most runners hate to stretch yet they've been inundated to stretch stretch stretch, so they think it's necessary. Well it's not. Should have listened to their bodies.