AcknowledgementsBesides 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
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
Different Technologies Work Together
Smart Phones and Tablets Racquet Sensors Wearable Technology
Analytics Apps Technical Apps Practice Apps
Useful Technology• Easy Learning Curve• Add Value to Lessons/Coaching• Frequent Use• Will Help Student (or Coaches)
What’s in Your Smart Phone?• Magnetometer• Satellite GPS• Gyroscope• Accelerometer• Proximity Sensor• (Barometer, Light Sensor, Heart Rate Monitor)
Racquet SensorsBabolat POPQLIPP SensorSony Smart Tennis SensorZepp Tennis Sensor
Basic Features of All:Identify shot type (Forehand, Backhand, Serve, Volley)Identify racquet head speedQualitative spin identificationStores data
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)
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
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
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
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
Tactical Analytics • Macro systems
• PlaySight• Hawkeye
• Micro systems• Pro Tracker• Game Changer• Traditional Stats (TennisStats, MyTennisStats)
20
Soccer and Basketball have been using cameras to track performance – like Hawkeye does for the ball
Now we can use the same XYZ data to track tennis players
Hawkeye- acce/decel data
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 EnergyExample of a player’s movement during
point
**Player tracking graph created for each point
Point start
point end
Physio and Mech load/intensity
Identify high-stress specific movements, match up with video
Assess within-point inefficiencies
Distance = 33.8 metersDuration = 16.04 secondsMax speed = 5.54 m/sKinetic Energy = 2835 JAcceleration Stress = 13.8Deceleration Stress = 7.71Acceleration 1 = 4Acceleration 2 = 1Acceleration 3 = 2Acceleration 4 = 3Deceleration 1 = 4Deceleration 2 = 2Deceleration 3 = 1Deceleration 4 = 2
Play-by-PlayVelocity Graph (meters/second)
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
Winning Probability
ProTracker$49.99• Traditional Stats• Service, Return, Deciding Shots Placement• Momentum• No Ad
• Not Flexible for Match Length
Game Changer• $24.99• Traditional Stats Specialty Shots• Service, Return, • Deciding Shots Placement• Various Scoring
• Not Flexible for • Match Length
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
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
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
Cameras, Tripods & Mounts
Split Screen Comparisons• Before and after correction/cue
• With a touring pro model
• Over time (e.g, 1-2 years)
• Different angles (multiple cameras)
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
What You Can Use• Racquet Sensor• Video Analysis for Technique• Analytics App• Whiteboard
• Now you are equipped!
Multiple Sensors
05/03/2023 TuringSense Confidential
MODEL EXTENSION (4 SEGMENTS)• FE
45
-40 -20 0 20 40 60 80 100 120 140-160
-140
-120
-100
-80
-60
-40
-20
0
20
X-Forward (cm)
Y-D
own
(cm
)Sagittal plane - Right
Elbow sagittal positionWrist sagittal positionInterface sagittal positionRacket sagittal position
What’s the Future?• More sophisticated analytics tracking• Combined Racquet + Court Sensor• Wearable Technology (multiple sensors for accuracy)• Integrated Tactical/Technical Coaching Systems