Race Comment Explainer

Original comment with matches highlighted:

close up, led 4 out, shaken up run-in, well,

Matched phrases & meanings

Phrase	Meaning
Close up	Running very near the leaders (usually 2nd, 3rd, or 4th).
readily	The horse won easily, without having to be pushed to its absolute limit, suggesting it had more to give.
Ran on	The horse maintained or increased its speed in the final stages.

Summary

Running very near the leaders (usually 2nd, 3rd, or 4th).
The horse won easily, without having to be pushed to its absolute limit, suggesting it had more to give.
The horse maintained or increased its speed in the final stages.