Category: Tennis

Analyze first and second serve , and rally length breakdown using exported data from Swing Tennis App

Back by popular demand, this blog post continues diving into making use of the data we captured via Swing App from my Apple Watch. 

If you are new to the tennis tracking via apple watch, please check out my introductory blog post.

If you are interested in tennis, and subscribed to the Pro version of the Swing App, you will be able to export all the data to a clean Excel format. That is really cool, but what can you do about it?

In this blog, I will share my experience of playing and analyzing the raw data for over 30 hrs over the past few months. Hopefully by reading this article, you will have slightly more incentive to make use of the data, after your hard fought game and logging via Apple Watch.

We will cover the following three topics with hands-on examples:

  • Basic data cleaning and data modeling for the required analysis using Excel build-in feature
  • How to breakdown the first and second serve performance with speed and distribution
  • How to breakdown the short, medium and long rally on game points

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Tennis score tracking and exported data analysis with Apple Watch using Swing App

Tennis score tracking and exported data analysis with Apple Watch using Swing App

During the winter of 2018-2019, I was able to take my tennis tracking journey into a new level.  By now most of my tennis hitting partners are calling me a “data nerd”, clicking my watch like crazy during the game. But when I show them the stats after the game, they all (seem to be) impressed.

I did the following two new things in particular:

  1. Used the “Point by Point + ” score tracking in the Swing App to track all the points I have played. In total, I tracked 18 matches over the last 4 month, all of them were single matches and played in 1 hour.
  2. Exported the captured data into spreadsheets. By analyzing the data set, I was able to identify some of the limitations, as well as some opportunities to further enhance the analytics experience.

Before we dive in, if you are interested in knowing the tennis tracking tools and methodology, or a high-level overview, you can check my 1st blog post of this series: Tennis tracking after 18 month of usage. Or if you prefer to track drills instead of match, you can check out my last post on advanced tennis shots tracking.

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Tracking tennis swing with Apple Watch (Series 4) and the updated Swing App

Tracking tennis swing with Apple Watch (Series 4) and the updated Swing App

It has been 9 months since I first shared experience to track tennis performance with Apple Watch.   Backing up by popular demand(Surprised so many visitors found this blog from search engine all over the world), I’d like to take it further with a more in-depth review, of my own experience tracking and analyzing my tennis workout with the Swing app.  

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Tracking tennis using Apple Watch – My own takes after 18 month of usage

Tracking tennis using Apple Watch – My own takes after 18 month of usage

Playing tennis has been a major part of my adult life: It is fun, competitive and a truly global sport. More importantly, it has shaped my character and my social network.  Over the past 18 months, I have been using my Apple Watch to track, and subsequently, to analyze my tennis performance along with swimming    

In this post, we will cover the background, the pros and cons of different apps, and how the additional metrics playing a role in my mindset shift.

Background – how it started

Prior to receiving my Apple Watch in Sep 2016, there are only two ways to see my tennis performance in retrospect:  win/lose — a quantitative measure, and my feeling after the game — a qualitative measure.

To be honest, I am happy with it for over 10 years. The smartwatch was intended to track swim, which will be so boring without the number. Pressing buttons before and after a tennis game doesn’t require much effort. It also brings at least one significant benefit: bragging about my “closed rings” to friends and family.

New data points shape my view

The availability of the additional metrics, empowered by technology (Watch + Apps), allows me to have a much more quantitative pulse of the workout.

The 1st thing I always look at is the “distance ran” during the workout because it is a measure reflecting how active on my court coverage.  

The 2nd metric is the “average heart rate”. It is a metric to measure the intensity. An app I used called “HeartWatch” did a great job bringing additional context to interpret the breakdown of each heart rate range.

Over time, It has gradually changed how I look at my tennis game.  I know a lot more how I did, and subsequently cares a lot less about winning (No more ugly winning) . Even if lose the game, or not play a match at all, I know it is a good workout, as long as running over 2km , and has an average bpm of 130+.

In short, my own focus has shifted toward fitness, instead of fulfilling my internal “competitive fire”. 

Bonus – Subconsciously, I felt I am getting more “value” out of each workout as well.  Just by looking at the number just generated, I must be feeling pretty proud. (Bingo! another mental trick)

Apps to track tennis

Not many Apps were available at the beginning, and my only choice was the native “workout” app offered by Apple.

The app starts fast – native app offered by Apple always has the advantage. But it is almost the only benefit. Tennis is not even included in the default drop-down list, and can be only available after selecting “others”.

I have been using the above two 3rd party apps:

  • One is called “Tennis Keeper“, built by a Canadian tennis athlete.
  • The other one is called “Swing” from the famous silicon valley 

Both of these two offered a lot more functionality than the native app:  Running distance – the one matters the most.  Also, both of them claimed to track shot type and speed. Unfortunately, the result wasn’t the as accurate as I would hope. 

Running Distance captured by Swing(top), compared to native Apple workout(bottom)

Swing is the app of my choice so far, mostly due to it can show “running distance” in the activity dashboard above.  The loading speed of the app is near my tolerance level – in my Series 2 apple watch, it requires over 10 seconds. That is not fun at all.  Maybe Apple is the one who should be blamed, considering its record of slowing down existing product to boost sales…

HeartWatch deserved special attention – It is a sophisticated health data analyzing app. My current usage is only touching its surface. What I like it the most, is it breaks down the workout by heart rate, and provide additional context for each heart rate range.  

  • Fat burn: 112-130 
  • Build Fitness: 131-148  
  • High Intensity: 149 – 167
  • Extreme:  167+

For example, I don’t like playing doubles because it is not intense enough. 

The data validates my “lack of intensity” theory, but also kindly reminding me – it also helps burning fat.  Of course, I want to burn fat – how can I burn more fat and faster, I guess I gotta play more doubles…


Compared to swimming, I feel I am just touching the tip of an iceberg using data to understand my tennis workout. I am hoping the app can make tracking a bit easier – for example making the app load within 3 seconds.  Also, if switching the watch to the dominating hand can make the app count 90% of the shot properly, I am willing to try it. Right now it is not even close.

Bonus – Here is my follow up post reviewing the Swing app in a much greater detail: Tracking tennis swing with Apple Watch (Series 4) and the updated Swing App

If you want to learn how I track my tennis match point by point, you can check out this follow up post: Tennis score tracking and exported data analysis with Apple Watch using Swing App

If you are an existing pro user and would like to try to make the most out of the exported excel dataset, please check out this recent post :

Lessons learned from an unexpected doubles tournament

Lessons learned from an unexpected doubles tournament

Tennis is a big part of my personal life.  Playing competitive level matches since 2006, I have won a few tournaments in the “club” level.  Ironically, I have never played in a doubles tournament ( never a fan of doubles game, and often complain about not even getting sweaty), nor have I played in a game organized by the companies I worked for (tennis might be such a “minority” sport that didn’t get much attention).

I broke both rules last week.

It was the 1st “3M Open” tennis tournament – featured only doubles matches. One of my colleagues in the lab signed me up for it.  We have played together a few times in the past but never played doubles as partners.  For both of us, the original goal was very clear –

“Enjoy the sunshine and have some fun. “

In the end, we brought the “3M cup” back home by winning three straight matches in a row. When I look back today, the experience was 100% memorable. But “fun” is not the appropriate word.  Instead, it is more of the mix of drama, pressure, heartbreak, teamwork, and a sense of relief.

Let me tell you why:

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Learnings from my 6th Western tennis open tournament

As a self-claimed NTRP 4.0 tennis player, I am really proud of my passion for tennis.  But I am writing this post not for sharing my passion and achievement of winning a tournament, but three pieces of learning I took away from it. Hopefully, they are helpful to my audience, no matter as a tennis fan or not.  

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