4. Alexander Zverev
Probably the most talented youngster in tennis, Zverev has a game that is not particularly suited for clay. However, this tall, big-serving lad from Germany has it in him to cause a few upsets and advance to the latter stages of the tournament.
Zverev can hit some glorious groundstrokes from the baseline, but he does need to improve his athleticism a touch. Despite that, Zverev's record on clay is pretty impressive. Even on a slower surface, his lethal serve and groundstrokes could prove to be dangerous for any opponent.
He would, however, have to work on improving his court coverage. Moreover, he is yet to win a match against Nadal.
Career head to head against Nadal: 0-4
2018 win-loss record: 14-6
What is the foot injury that has troubled Rafael Nadal over the years? Check here