Janessa Michelle Fonseca Romero (born May 30, 2001) is a Puerto Rican karateka competing in the kumite. She is a silver medalist at the World Karate Championships, gold medalist at the Pan American Games, and a two-time gold medalist at the Central American and Caribbean Games.
Career Fonseca competed in the 2018 Summer Youth Olympics in the +59 kg category.
In June 2021, Fonseca competed at the World Olympic Qualification Tournament held in Paris, France to compete at the 2020 Summer Olympics in Tokyo, Japan. In November 2021, she competed in the women's 61 kg event at the 2021 World Karate Championships held in Dubai, United Arab Emirates, where she reached the third round. By December, she won the gold medal in her event at the 2021 Junior Pan American Games held in Cali, Colombia.
In July 2023, Fonseca won the gold medal in her event at the 2023 Central American and Caribbean Games held in San Salvador, El Salvador. In November 2023, she won the gold medal in her event at the 2023 Pan American Games held in Santiago, Chile. In May 2024, at the Pan American Championships held in Punta del Este, Uruguay, Fonseca competed in the 68 kg event and won a gold medal after defeating Anastasiia Velozo.
In November 2025, Fonseca competed in the 68 kg event at the World Karate Championships and won the silver medal, becoming the first Puerto Rican to win a medal in the competition. In August 2026, she won the gold medal in her event at the 2026 Central American and Caribbean Games held in Santo Domingo, Dominican Republic.
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