A playing card showing one pip, highest or lowest in rank

• A die face with a single dot, the number one

A serve that the opponent fails to touch

• A point won by a single unreturned stroke

An expert or person outstanding in a field

• The best starting pitcher on a baseball team

To do extremely well on, often with a perfect score

• To win a point with an unreturned serve
• To make a hole in one in golf

Excellent; outstanding

A fighter pilot credited with downing at least five enemy aircraft