3. Alexander Zverev
The whole tennis world will be eyeing the German in 2018 to find out if he can build on his exploits this year and establish himself as a genuine top player. It was painful seeing his performance at the Slams this season, as he reached the second week just once.
That said, if he carries on the brilliance he showcased at the Masters 1000 events, there's no reason why he cannot hang in at the top.
Prediction: Top 5
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Edited by Musab Abid