Race Comment Explainer

Original comment with matches highlighted:

chased leaders, out, no chan in 3rd after 3 out, no chance with winner,

Matched phrases & meanings

Phrase	Meaning
Chased leaders	Running directly behind the horses in front of the field.
Pushed along	The jockey started to urge the horse (hand-riding, not necessarily using the whip).
One pace	The horse maintained its speed but could not accelerate or quicken.

Summary

Running directly behind the horses in front of the field.
The jockey started to urge the horse (hand-riding, not necessarily using the whip).
The horse maintained its speed but could not accelerate or quicken.