Sentence

彼の馬は着々と対抗馬に追いついた。

(かれ)(うま)着々(ちゃくちゃく)対抗馬(たいこうば)()いついた。
His horse gained steadily on his rivals.
Sentence

本命と対抗馬が競り合ったお陰で、ダークホースの彼が漁夫の利を得たってわけだ。

本命(ほんめい)対抗馬(たいこうば)()()ったお(かげ)で、ダークホースの(かれ)漁夫(ぎょふ)()()たってわけだ。
Since the favorite and his rival were running against each other a dark horse like him was able to pull out in front.