5 sentences

1. 他决定向卫冕冠军发起挑战。

   tā jué​dìng xiàng wèi​miǎn guàn​jūn fā​qǐ tiǎo​zhàn.

   He decided to challenge the defending champion.

   Source: Dong Chinese Dictionary

2. 我们在决赛中输给了卫冕冠军。

   wǒ​men zài jué​sài zhōng shū​gěi le wèi​miǎn guàn​jūn.

   We lost to the defending champions in the final.

   Source: Dong Chinese Dictionary

3. 卫冕冠军在小组赛中意外出局。

   wèi​miǎn guàn​jūn zài xiǎo​zǔ​sài zhōng yì​wài chū​jú.

   The defending champion was unexpectedly eliminated in the group stage.

   Source: Dong Chinese Dictionary

4. 我们在决赛中击败了卫冕冠军。

   wǒ​men zài jué​sài zhōng jī​bài le wèi​miǎn guàn​jūn.

   We defeated the defending champion in the final.

   Source: Dong Chinese Dictionary

5. 我们球队本周将在客场挑战卫冕冠军。

   wǒ​men qiú​duì běn zhōu jiāng zài kè​chǎng tiǎo​zhàn wèi​miǎn guàn​jūn.

   Our team will challenge the defending champion away from home this week.

   Source: Dong Chinese Dictionary