Race Comment Explainer

Original comment with matches highlighted:

close up, tracked leader 7f out until 5f out, soon quickly,

Matched phrases & meanings

Phrase	Meaning
Tracked leader	Followed closely behind the leaders.
tailed off	A definitive statement that the horse was finished and effectively out of the race
Weakened	The horse lost speed and dropped back through the field.
Close up	Running very near the leaders (usually 2nd, 3rd, or 4th).

Summary

Followed closely behind the leaders.
A definitive statement that the horse was finished and effectively out of the race
The horse lost speed and dropped back through the field.
Running very near the leaders (usually 2nd, 3rd, or 4th).