赛跑

Pinyin: sài pǎo
Meaning：Race; running
Sentence：一个赛跑者在转最後一弯时被人挡住了。One of the runners got boxed in on the final bend.

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赛：

Pinyin: sài
Meaning: Match; to compete; competition
Radical: 贝
Stokes: 14
Traditional: 賽
Common words/Phrase:
赛车 [sài chē] 【racing car】
赛马 [sài mǎ] 【horse race】
比赛 [bǐ sài] 【match】

跑：

Pinyin: páo, pǎo
Meaning: To run; to escape
Radical: 足
Stokes: 12
Traditional: 跑
Common words/Phrase:
跑车 [pǎo chē] 【sports car】
跑道 [pǎo dào] 【track】
跑龙套 [pǎo lóng tào] 【to play a small role】
跑酷 [pǎo kù] 【parkour】
跑马 [pǎo mǎ] 【horse race】