In this task, you're given five sentences, numbered 1 through 5. Your job is to generate a title for the story that makes complete sense. The title must be short, with less than three words, use simple language, and include the main topic of the story.

Sentence 1: Jan was playing tennis. Sentence 2: She was about to hit the ball when she missed. Sentence 3: However, the missed ball hit her in the head. Sentence 4: Jan thought she was okay but got dizzy. Sentence 5: The doctor diagnosed Jan with a slight concussion.
Tennis