Critical tennis situation

• Critical situation on the court
• Climactic tennis match situation
• Tennis coup
• Tennis-match highlight
• Crucial tennis situation
• Score of 5-4, 40-15, say
• 5-4, 40-30, for example
• Situation in which service is important

Wiktionary Word definitions in Wiktionary
n. The command signal or value which is fed into a controller to establish the target or desired position or state of the controlled device or process.