Related Clues:

• 50-50, say
• It may be past or present
• Nerve-racking
• Needing an extra quarter, perhaps
• On the verge of snapping
• Grammar class subject
• Antsy
• Requiring sudden death
• Even, as a score
• In need of a break?
• Like two with love, in tennis
• Ready to snap
• Showing strain
• Strung out
• Drawn