Top 5 tennis players under the age of 20 

2016 US Open - Day 14

#3 Frances Tiafoe

2017 Miami Open - Day 6

There have been a lot of tennis stars who have come out of the United States of America but ever since Andy Roddick's retirement, no one has done anything too significant.

However, this could change soon with 19-year-old Frances Tiafoe slowly making his mark on the big stage. His performance in the first round of the US Open against 19-time Grand Slam champion Roger Federer would not be forgotten soon, despite him ending up on the losing side.

Most of the tennis stars from the USA are parochial and do not have too much to show for apart from a huge serve but Tiafoe has a lot more in his locker.

He has won two titles on the Challenger tour this year and has had few breakthrough performances in the ATP World Tour as well. He is currently 9th in the race to qualify for the Next Gen Finals and will battle it out with Hyeon Chung and Daniil Medvedev for the final spot.

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