Mai Watanabe is a 26-year-old professional football player from JPN. He currently plays for Sanfrecce Hiroshima Regina, wearing the number 18 shirt. He plays primarily as a Defender. He stands at 157cm tall and weighs 52kg.

Throughout the Women Empowerment League 2025-2026, Mai Watanabe featured in 16 matches, averaging 0 tackles, 0 interceptions, and 0 clearances per game, while blocking 0 shots per game.