Peanuts by Charles Schulz for June 05, 1973
Transcript:
Snoopy wears a visor and holds a tennis racket. He tosses the ball up to serve.<BR><BR> Snoopy serves the ball.<BR><BR> Snoopy sticks out his tongue and teases his opponent.<BR><BR> Snoopy smiles and thinks, "Actually, after you ace someone, you really shouldn't say, 'Nyahh, nyahh, nyahh!'"<BR><BR>
Seems this series of strips was the inspiration for the Snoopy Tennis Game and Watch gadgets that Nintendo produced about ten years later.