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The Hidden Mathematics of Sport The 2026 USTA’s Friend at Court is Out… and a Foot Fault! The Racquet Bag Leaf Blower: A Small Tennis Tech Upgrade Tennis Beyond the Headlines: March 2, 2026 Beyond the Bell Curve: Why Competitive Tennis Ecosystems Need Edges The Participation Pyramid and the Cost of Lopping Off the Top Winter Is No Longer Coming: The LTA’s County Cup Decision

Maple Syrup as Energy Gel

On By Teresa Merklin

“Fireball.” That was my absolutely favorite comment I received via Facebook after posting “The 2020 Ultimate Stocking Stuffer List for Tennis Players” last Friday. For inexplicable reasons, that comment reminded me of this clip of Vasek Popisil chugging a brown liquid from a bottle during a change over earlier this year. In that case, the substance being consumed was not his “on-court liquor of choice” — which I recently learned is a widespread phenomenon — but rather Maple Syrup.

Tennis and Corrective Lenses: A Low Tech Solution

On By Teresa Merklin

I have worn glasses since I was about ten years old. I will never forget the day that my first pair of prescription lenses arrived. The first stop after we picked them up and had them fitted at the optician was one of the local tennis centers. We had hit balls for a few short minutes when the umpire who gave birth to me excitedly called me up to the net to tell me that I was playing really well in the new specs. From my side of the court, I didn’t notice much of a difference.

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Pulse Oximeter Training

On By Teresa Merklin

I recently purchased and started using a pulse oximeter as a part of my tennis training. If you have been in a medical setting recently, chances are that you have already had one of these devices slipped onto your finger. However, the availability of pulse oximeters in the consumer market is a fairly recent development. Most people probably don’t have one at home.

Training with a Heart Rate Monitor

On By Teresa Merklin

Last week in “Low-Impact Interval Training” I outlined a training routine that I developed after learning that USTA Player Development regularly uses low-impact cardio machines for interval training. Low-Impact refers to the amount of stress placed on the joints. The workout itself is extremely high intensity and effort. If I am going to work that hard, then I am also going to collect data to know if it is effective.

The EGO Leaf Blower

On By Teresa Merklin

It rained during the early rounds of the US Open this year. I was completely disinterested in the two matches in progress on the courts in the covered stadiums at that time. Rather than switching over, I left the stream rolling on the rainy court. It was peaceful. For inexplicable reasons, I enjoy watching rain fall on a tennis court — as long as I am not the one actually waiting to play.