Most tennis players already wear a smartwatch. Few use the data well. Here's what's worth importing into your match log and what's noise.

Worth tracking

Average heart rate — a proxy for match intensity. Useful for comparing matches.
Max heart rate — spikes correlate with long rallies and pressure points
Active time — actual playing time, much shorter than total court time
Calories — useful only as a relative number across your own matches

Mostly noise

Shot count — current watch sensors over- and under-count badly
Shot type detection — forehand vs backhand classification is unreliable
"Tennis score" features — none of them work without manual entry

The HR pattern that matters most

Heart rate recovery between points. If you're still above 140 bpm 20 seconds after a long rally, your conditioning is the limiting factor in your third sets. Track it across matches and you'll see it improve as you get fitter.

Importing into Tennis Log

Tennis Log accepts smartwatch screenshots and parses HR, calories, and active time automatically. Just take the screenshot at the end of your match and attach it to the entry — the AI does the rest.