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Which tennis events call lines electronically, 2017-2026: the slides
10 slides on which tennis events call lines electronically, built only from our free line-calling dataset (version 1.0.0, 22 October 2026). Present them from this page, print them, or download one HTML file that opens offline.
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Which tennis events call lines electronically, 2017-2026
From the Live Tennis API line-calling dataset, version 1.0.0, released 22 October 2026. Free under CC BY 4.0.
https://livetennisapi.com/data/tennis-line-calling/slides
1 / 10
The short answer
As of 22 October 2026, every ATP Tour event has used live electronic line calling, with no line judges, since the start of 2025. The Australian Open (2021), the US Open (2021) and Wimbledon (2025) also call every line electronically. Roland Garros is the one Grand Slam that still uses human line judges, and it kept them in 2026.
2 / 10
What the dataset holds
- 278rows, one per event, season and tour
- 38events
- 2017-2026seasons
- 75source pages cited
3 / 10
How lines were called, season by season
| Season | Line judges only | Line judges and challenges | Electronic on some courts | Electronic on every court | No trusted source | Rows |
|---|
| 2017 | 5 | 18 | 0 | 1 | 1 | 25 |
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| 2018 | 6 | 18 | 0 | 1 | 0 | 25 |
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| 2019 | 5 | 18 | 0 | 1 | 2 | 26 |
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| 2020 | 1 | 2 | 1 | 3 | 4 | 11 |
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| 2021 | 2 | 3 | 0 | 11 | 9 | 25 |
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| 2022 | 2 | 1 | 0 | 7 | 16 | 26 |
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| 2023 | 2 | 1 | 0 | 5 | 20 | 28 |
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| 2024 | 3 | 3 | 0 | 10 | 13 | 29 |
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| 2025 | 1 | 0 | 0 | 32 | 12 | 45 |
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| 2026 | 1 | 0 | 0 | 36 | 1 | 38 |
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Counts of dataset rows. Each row is one event, season and tour.
4 / 10
The first events with no line judges
Rows before 2021 that record electronic calling on every court:
- Next Gen ATP Finals 2017 (ATP)
- Next Gen ATP Finals 2018 (ATP)
- Next Gen ATP Finals 2019 (ATP)
- ATP Finals 2020 (ATP)
- Cincinnati Open 2020 (ATP)
- Cincinnati Open 2020 (WTA)
5 / 10
The four Grand Slams
| Grand Slam | Status | System named |
|---|
| Australian Open | Electronic on every court since 2021 | Hawk-Eye Live |
|---|
| Roland Garros | Line judges in 2026 | None named |
|---|
| Wimbledon | Electronic on every court since 2025 | Hawk-Eye Live |
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| US Open | Electronic on every court since 2021 | Hawk-Eye Live |
|---|
Why the US Open date is 2021
Sources disagree on the first US Open with no line judges. An NPR report from September 2022 reads as if 2022 was the first fully electronic year. We use 2021. The USTA announced in May 2021 that Hawk-Eye Live would cover every court that year. ESPN reported in September 2022 that the US Open extended the system to Ashe and Armstrong in 2021. AP reported from the 2021 semi-finals that there were no line judges to argue with. An AP report from October 2024 also says the US Open has had no line judges since 2021.
7 / 10
How sure is each row?
- 41confirmed
- 159inferred
- 78unknown
- Many rows are inferred from tour-wide rules. A rule says what events had to do. It does not prove what happened at each one.
- Court-by-court detail is rarely published. elc_all_courts rows that rest on a tour rule have not been checked court by court.
9 / 10
Can I use these slides?
Yes. The data is under CC BY 4.0, so you can show, change and share the slides, in class or at work. Keep the credit line on the last slide. If you change the numbers or drop slides, say so.
Found a wrong row? Open an issue on GitHub with a source, and the slides change when the dataset does.
These slides use dataset version 1.0.0, released 22 October 2026.
Live Tennis API