Tennis Sports technology Sports analytics

1. Doug Eng EdD PhD
douglasweng@yahoo.com
6172818368
Hand-Held Tennis Technology
and How
It Can Enhance Your Coaching

2. Acknowledgements
Besides the usual suspects,
• Paul Robbins, Stats.com LLC
• Donny Soh, QLIPP
• Rick Gould, TuringSense
• Yuval Bar Yosef, PlaySight
• Peter Lyons, Babolat
• USTA PD & Sport Science Committee

3. Technology - How Can it Help?
• Measure Physical abilities
• Enhance Teaching
• Analysis of Tactics (Analytics)
• See New Things (we never noticed)
• Understand Techniques and Tactics
• Revolutionize Learning
• Excitement – new twists

4. Different Technologies Work Together
Smart Phones and Tablets Racquet Sensors Wearable Technology
Analytics Apps Technical Apps Practice Apps

5. Useful Technology
• Easy Learning Curve
• Add Value to Lessons/Coaching
• Frequent Use
• Will Help Student (or Coaches)

6. What’s in Your Smart Phone?
• Magnetometer
• Satellite GPS
• Gyroscope
• Accelerometer
• Proximity Sensor
• (Barometer, Light Sensor, Heart Rate Monitor)

7. Racquet Sensors
Babolat POP
QLIPP Sensor
Sony Smart Tennis Sensor
Zepp Tennis Sensor
Basic Features of All:
Identify shot type (Forehand, Backhand, Serve, Volley)
Identify racquet head speed
Qualitative spin identification
Stores data

8. Babolat POP
• Price $69 (MSRP $89)
• Easy to Set Up
• Works with All Racquets
• Can Compare with friends
• Intrusive wrist band
• Misses some shots (misses ~10-20%)
• Short battery & bluetooth issues
• Misidentifies some shots (~10%, poor wrist placement)
• Poo speed accuracy (10-25% off)

9. QLIPP Sensor
• Price $99 (MSRP $129)
• Easy to Set Up
• Unintrusive Placement on Strings
• Works with All Racquets
• Video Pairing
• Ball & Racquet Speed
• Sweet spot
• Records almost all shots (~98+%)
• Longest Battery and best Bluetooth pairing
• Speed Accuracy is good (~10%)
• Records Qualitative Spin
• Can be tough to remove

10. Sony Smart Tennis Sensor
• Price $165 (MSRP $199)
• Can Take a While to Set Up
• Unintrusive Placement on Butt
• Works with Some Latest Racquet Models (HEAD, Prince, Wilson, Yonex)
• Video Pairing with Data on Video
• Ball & Racquet Speed
• Graphical Display
• Records most shots (~90-95+%)
• Short Battery and poor Bluetooth pairing
• Speed Accuracy may be best(~5-10%)
• Records Qualitative Spin

11. Zepp Tennis Sensor
• Price $99 (MSRP $149)
• Needs calibration and set up takes some time
• Intrusive Placement on Butt (Flex Mount, Pro Mount)
• Works with All Racquets
• Ball & Racquet Speed
• 3D Serve
• Records nearly all shots (~98+%)
• Good battery and bluetooth
• Speed Accuracy is fair (~10-15%)
• Records Qualitative Spin
• Can misidentify shot types and spins

12. QLIPP FEATURES

13. QLIPP MODE 3: SERVE MODE
• Calculates the serve form:
• Ensures there is proper backswing, good
acceleration and follow through
• Calculates the estimated serve speed based a
combination of:
• Racquet head speed
• Racquet acceleration
• Sweet spot

14. Tactical Analytics
• Macro systems
• PlaySight
• Hawkeye
• Micro systems
• Pro Tracker
• Game Changer
• Traditional Stats (TennisStats, MyTennisStats)

20. 20
Soccer and Basketball have been using cameras
to track performance – like Hawkeye does for
the ball

21. Now we can use the same XYZ data to track
tennis players
Hawkeye- acce/decel data

22. Distance (meters)
Meters player traveled during point
Duration (seconds)
Time duration of each point
Max Speed (max [meters/second])
Max speed within each point
Average Speed (avg [meters/second])
Average Speed during each point
Kinetic Energy (sum[1 kg meter2 / second2])
Total Kinetic energy used in each point
Accel/decel loads and numbers based on
intensity
Speed and Energy
Example of a player’s movement during
point
**Player tracking graph created for each point
Point start
point end

23. Physio and Mech
load/intensity
Identify high-stress specific
movements, match up
with video
Assess within-point
inefficiencies
Distance = 33.8 meters
Duration = 16.04 seconds
Max speed = 5.54 m/s
Kinetic Energy = 2835 J
Acceleration Stress = 13.8
Deceleration Stress = 7.71
Acceleration 1 = 4
Acceleration 2 = 1
Acceleration 3 = 2
Acceleration 4 = 3
Deceleration 1 = 4
Deceleration 2 = 2
Deceleration 3 = 1
Deceleration 4 = 2
Play-by-Play
Velocity Graph (meters/second)

24. The aim of this paper is to discover patterns of player movement and
ball striking in tennis using HawkEye data which are indicative of changing
the probability of winning a point.
“The Thin Edge of the Wedge” Xinyu Wei1, Patrick Lucey2, Stuart Morgan3, Machar Reid4 and
Sridha Sridharan1
: Accurately Predicting Shot Outcomes in Tennis using Style and Context Priors

25. Winning Probability

33. ProTracker
$49.99
• Traditional Stats
• Service, Return,
Deciding Shots Placement
• Momentum
• No Ad
• Not Flexible for
Match Length

34. Game Changer
• $24.99
• Traditional Stats
Specialty Shots
• Service, Return,
• Deciding Shots Placement
• Various Scoring
• Not Flexible for
• Match Length

35. Micro Video Analysis
• Low Budget
• Smart Phone for Camera and App Software
• Comparison Side by Side, Pro Library
• Sharing with Students and Community
• Storage and Saving Files

36. Comparison of Video Analysis Apps
(all available on iTunes and Google play)
• Multiple tiers for features &
storage ($4.99 and up)
• High Speed - good
• Good video quality, loss in
upload
• Learning Curve - easy
• Voice Analysis – excellent, during
video
• Import/Export – Easy without
locker, allows from camera roll,
youtube, GoPro
• Sharing – Easy, public
• Tools – good
• GRADE = A-
• Base Cost=$6.99 (ncludes angle
tool) - multiple tiers for storage,
can be pricey
• High Speed - good
• Good video quality
• Learning Curve – moderate
• Voice Analysis – good, need to
make stills, key positions are
useful
• Import/Export –allows from
camera rolls, also Dartfish
locker
• Sharing – closed
• Tools – excellent, synch wheel
is best
• GRADE = B
• Free - but tiers for comparison
& storage
• High Speed – best built in
• Fair video quality
• Learning Curve – easy
• Voice Analysis – during video
• Import/Export – easy, camera
roll
• Sharing – easy, public
• Tools – fair
• GRADE = B+
COACH’S EYE DARTFISH EXPRESS HUDL

37. Features & Tools
• Import & Export
• Synch Wheel
• Tools (angles, distances, arrows, lines, circles)
• Titles, comments
• Voiceovers
• All apps have basic tools. Angles and measuring are more
advanced.
• BASICS TOOLS arrows, lines, circles

38. Cameras, Tripods & Mounts

39. Split Screen Comparisons
• Before and after correction/cue
• With a touring pro model
• Over time (e.g, 1-2 years)
• Different angles (multiple cameras)

41. Whiteboard Apps
• Scout Free
• Free
• No Learning Curve
• Hand drawing
• CoachNote
• $4.99 ($1.99 Google)
• Moderate Learning Curve
• Can customize
• Can do many sports
• Icons – could use better tennis icons

43. What You Can Use
• Racquet Sensor
• Video Analysis for Technique
• Analytics App
• Whiteboard
• Now you are equipped!

44. Multiple Sensors

45. MODEL EXTENSION (4 SEGMENTS)
• FE
2/16/2017 TuringSense Confidential 45
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-160
-140
-120
-100
-80
-60
-40
-20
0
20
X-Forward (cm)
Y-Down(cm)
Sagittal plane - Right
Elbow sagittal position
Wrist sagittal position
Interface sagittal position
Racket sagittal position

46. What’s the Future?
• More sophisticated analytics tracking
• Combined Racquet + Court Sensor
• Wearable Technology (multiple sensors for accuracy)
• Integrated Tactical/Technical Coaching Systems