We experimentally investigate the difference in competitiveness of 3–5 year-old boys and girls in the U.S. 123 children from a preschool are randomly matched into girl–girl, boy–boy, and boy–girl pairs of similar age and participate in a gender-neutral, competitive classroom activity using candy as an incentive. Children participate in a piece rate incentive scheme and a tournament incentive scheme in rounds 1 and 2, and select their preferred incentive scheme for round 3. We find that girls and boys choose to compete at equal rates – with 80% of children choosing to compete overall. We also find that girls’ output in the task is significantly lower than that of boys under the tournament scheme, but not different in round 3 for the girls and boys who self-select into the tournament. All children display a remarkable rate of confidence – 84% of children believe they won under the tournament scheme. The gender of the match does not play a significant role.