Related Clues:

• 5K, e.g.
• Beat fast, as a heart
• Le Mans event
• 10-K, for one
• See 59-Down
• Competition
• Go lickety-split
• Track and field activity
• What hearts sometimes do
• Election contest
• Move quickly
• "Seabiscuit" nail-biter
• Hurry up
• Run for the money
• Election Day lead-in