2 sentences for 出马 (chū​mǎ)

1. 他决定出马竞选下一任市长。

   tā jué​dìng chū​mǎ jìng​xuǎn xià yī rèn shì​zhǎng.

   He has decided to run for the next mayoral election.

   Source: Dong Chinese Dictionary

2. 只要他亲自出马，这件事情就一定能办成。

   zhǐ​yào tā qīn​zì chū​mǎ, zhè jiàn shì​qing jiù yī​dìng néng bàn​chéng.

   As long as he takes care of it personally, it will definitely get done.

   Source: Dong Chinese Dictionary