Originally Posted by Towser83
Off the top of my head
5. Del Potro
maybe dimitrov in the top 20.
I agree completely with your 10 picks but perhaps in a slightly different order. Since Cilic's high rank of 9 in Feb 2010 he fell to 32 in July 2011. However, in the last 18 months he's been back up as high as 13(currently 15). Therefore, it seems a good shout for him continuing to creep back up and finish 9/10 by the end of next year.
My outside pick is Tomic to be top 20 in 12 months time. His focus on tennis is the biggest question mark of course. But of all the up and coming players, I think he has the most potential, despite a disappointing 2012. He still has time on his side, seeing as he's the only guy aged under 21 in the top 140, I believe.