When you lose track of your child, it doesn't matter if you're at home, at the mall or taking in a tennis match. There's only one feeling that floods through you: absolute panic.

Perhaps No. 4-ranked tennis star Rafael Nadal recognized that panic in a mother's voice on Wednesday, when she was heard calling "Clara!" during an exhibition doubles match in Majorca, Spain. The woman had lost her toddler, Clara, in the crowd.

Nadal responded by holding his serve until security and members of the crowd were able to help the woman find her daughter.

The mother and daughter were soon reunited in an emotional hug, which brought tears to the eyes of one of Nadal's opponents, retired tennis great John McEnroe.