Here is some advice:

• Encourage fun above all else: Remind your child that tennis is first and foremost a game and that it should be fun. Enjoyment and a love for the sport are essential for long-term participation.
• Focus on effort, not just results: Praise your child for their hard work and effort, regardless of the final score. This will help them understand that improvement and perseverance are more important than winning.
• Listen and support: Be attentive to your child's needs and feelings. If they are frustrated or discouraged, offer emotional support rather than unsolicited advice or criticism.
• Avoid comparisons: Do not compare your child to other players. Every child progresses at their own pace, and comparisons can be demotivating and create a sense of pressure.
• Be a model of sportsmanship: Lead by example by displaying positive sporting behavior. Encourage values of respect, fairness, and kindness, both on and off the court.
• Foster independence: Let your child make decisions about their game, training, and goals. This autonomy will help them develop their self-confidence and love for the sport.
• Celebrate small victories: Acknowledge and celebrate small successes, whether it's a good shot, a technical improvement, or a positive attitude in the face of defeat. (With my son, we often say that the important thing is to progress in the game and that the ranking will come later).
• Maintain a balanced perspective: Remember that your child's personal development is more important than medals or trophies. Tennis should contribute to their overall fulfillment, not be a source of stress.