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Dec 02 2020

Stat of the Week | December 2, 2020

Every week, Tennis Analytics dives deep into the data, bringing you a stat of the week to help you understand tennis better and become a little smarter.

In December, we will look at junior data from the 2018 and 2019 Junior Orange Bowl, featuring some of the world’s top young players.  


Stat of the Week: 34%

At the girls under 12’s and 14’s level, one out of every three (34%) 2nd serve points lost is due to a double fault.

Of all 2nd serves hit for this group of players, nearly one in five is a double fault. The average is 19%, but the difference between the winners and losers is 6%.

  • Match winners double fault on 16% of 2nd serves.
  • Match losers double fault on 22% of 2nd serves.

See the graph below for more girls 12’s & 14’s serve data.


Junior tennis girls 12s and 14s serve data
*It adds to 101% because of rounding.

Point of the Week

Double faults are not all bad.

The important number, which we will look at next week, is the 1st and 2nd serve win percentage.

Would you rather have a high 2nd serve percentage OR a high 2nd serve win percentage?

  • You make 100% of 2nd serves and lose every point = 0% 2nd serve points won.
  • You make 50% of 2nd serves and win 100% of those points = 50% 2nd serve points won.

I’ll take the latter option.

How many double faults do you serve per match? What is your 1st & 2nd serve win percentage?

Check out our Player Packages to find out


Photo of the Week

Bianca Andreescu’s serve.

Bianca Andreescu Serve

Written by Warren Pretorius & Will Boucek · Categorized: Stat of the Week

About Warren Pretorius & Will Boucek

Each post is written by Will Boucek, in collaboration with Warren Pretorius.

Warren is the founder & CEO of Tennis Analytics. He is a USPTA Master Professional, speaker, and strategy coach for ATP & WTA pros.

Will is a writer and content strategist for Tennis Analytics. Will is also the founder of The Tennis Tribe and Tennis Tribe Marketing. He played college tennis and has over a decade of coaching experience.

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