Based on the information provided, Medvedovich most likely has an advantage over Nakashima in the upcoming match. Medvedovich is talented and supported by Djokovic himself, playing at home in Belgrade, which adds to his confidence. Nakashima, who plays uncertainly outside of America and feels fatigued towards the end of the season, may struggle in a smaller tournament. Therefore, it is more likely that Medvedovich will win this match.