表示“100米赛跑”以及类似的“500米赛跑”“1000米赛跑”等，以下表达都是可以的：
▲100-metre race
Evans visualized every step he would take in the 400-meter race.（《朗文美语词典》）
Everybody believes he will be the winner of the 100-metre race.（2000上海高考春季卷）
▲100 metre race
He is competing in both the 100 and 200 metre races.（《轻松英语学生词典》）
I won the 60 metre race, my first senior success.（《朗文当代英语辞典》）
▲500 metres race
She won first prize in the 100 metres race.（《牛津高阶英汉双解词典》）
Are you planning to go in for the 100 metres race? （《剑桥高级英语词典》）
▲顺便说一句，有时还可以省略 race 直接说 100 metres。如：
The women’s 5, 000 metres was won by Jones.（《英语用法指南》）
He won the senior men's 400 metres.（《牛津高阶英汉双解词典》）