Novak Djokovic is coming off of back-to-back wins at Indian Wells and the Sony Open. This makes him the player with the most momentum going into the ATP European clay-court stretch.
However, as the tour shifts to the red dirt, Djokovic may find himself on less-than-solid ground. Despite his 16-2 record and lead in this year's points race, Djokovic heads into the trickiest part of the tour for him.
Even after a convincing straights sets win over Rafael Nadal in Miami, Djokovic will be the underdog on clay.
Within striking distance of Nadal's No. 1 ranking, Djokovic may have to dethrone the king of clay to recapture the top spot. That's just one of several challenges facing Djokovic going into the clay-court season.