Race Comment Explainer

Original comment with matches highlighted:

prominent, pushed along 2f out, soon struggling, gradually final

Matched phrases & meanings

Phrase	Meaning
Pushed along	The jockey started to urge the horse (hand-riding, not necessarily using the whip).
Weakened	The horse lost speed and dropped back through the field.
Furlong	Unit of distance; one furlong is 1/8 of a mile (approx. 200 meters).

Summary

The jockey started to urge the horse (hand-riding, not necessarily using the whip).
The horse lost speed and dropped back through the field.
Unit of distance; one furlong is 1/8 of a mile (approx. 200 meters).