Race Comment Explainer

Original comment with matches highlighted:

led briefly before 2nd, tracked leader, d soon after 2 out, soon after

Matched phrases & meanings

Phrase	Meaning
Tracked leader	Followed closely behind the leaders.
ridden before	The jockey started urging the horse aggressively before the second-last obstacle to try and get it back into contention.
Led briefly	Took the lead momentarily before being overtaken.
Weakened	The horse lost speed and dropped back through the field.

Summary

Followed closely behind the leaders.
The jockey started urging the horse aggressively before the second-last obstacle to try and get it back into contention.
Took the lead momentarily before being overtaken.
The horse lost speed and dropped back through the field.