Kenny Roberts Jr.'s main challenger for the 2000 MotoGP championship was Valentino Rossi. As a rookie rider that year, Rossi put up a strong fight against Roberts Jr., who ultimately won the title. The competition between them was intense, and Rossi would later become a dominant figure in the sport, but in 2000, it was Roberts Jr. who secured the championship with four wins and nine podium finishes. Valentino Rossi, despite his rookie status, was a formidable opponent and would go on to win many championships in the following years. This information is supported by various sources, including Wikipedia and MotoGP official profiles 1, 2.
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