先せん行こう馬ば

noun

front runner; front-running horse

Horse racing term for a horse that runs near the front of the field, often setting the pace.

• あの先せん行こう馬ばはスタートから先せん頭とうに立たった。

  That front runner took the lead from the start.

• 先せん行こう馬ばがペースを握にぎると、後こう続ぞくは苦くるしくなる。

  When the front runner controls the pace, the chasers have a hard time.