A player tossed the ball for a serve and the camera caught her with mouth wide open, chin up, and an expression that suggested the ball personally offended her on the way up. Serve faces are tennis's most reliable source of comedy. Every player has one. No player wants to see theirs.
The serve toss requires looking upward while opening the body for the swing. The mouth opens for breathing. The jaw drops for relaxation. The eyes track the ball with laser focus. Combine these elements in a still frame and the result is a face that the player's agent requests be removed from the tournament's official photo gallery. This request is always denied. The photo galleries know what drives traffic.