Tennis adopted electronic line calling on clay and created a ball-mark monster

“Can you make it make sense?” Alex Eala requested after her defeat to Iga Świątek at the 2025 Madrid Open.

Eala, the 20-year-old rising expertise from the Philippines, was not speaking about her three-set loss, however moderately a ball mark on the event’s purple clay courts. Early within the match, Świątek hit a serve that the mark on the clay confirmed to be out, however didn’t out name got here: the electronic line calling (ELC) system decided it to be in.

“I mean, the mark is the physical, it’s the physical proof,” Eala stated.

One 12 months on, on the identical event, it was Australian Open champion Elena Rybakina’s flip. Gesturing that a ball mark after a Zheng Qinwen serve was clearly out, she confronted the chair umpire.

“This is not a joke. The system is wrong. This is not a joke. It is not touching. It is absolutely wrong,” Rybakina stated earlier than successful in three units.

“It’s kind of a stolen point. I understand it was her serving and she was serving really well, but it’s really frustrating,” she advised reporters afterward.

Rybakina and Eala have been describing an more and more common prevalence for tennis stars on clay courts: being advised to not imagine their eyes. For many years, tennis occasions performed on clay have relied on human line judges calling the bounce of the ball and chair umpires coming down to examine the marks they depart within the purple grime. At some occasions, ELC has been launched, and it’s disagreeing with what the gamers can see.

Some have even taken pictures of the ball mark they imagine proves their case. In Madrid final 12 months, No. 1 seed Alexander Zverev used his cellphone to take a picture of a hint after a shot he believed to be out from Alejandro Davidovich Fokina was dominated in. Women’s world No. 1 Aryna Sabalenka did the identical factor a week earlier in Stuttgart, Germany, this time to doc a shot she believed was in however had been dominated out. At that occasion, ELC was not put in, with Sabalenka disagreeing with a line choose’s name. Both gamers obtained code violations for unsportsmanlike conduct.

In Madrid, Zverev insisted in his post-match information convention that there was a “defect in the system” at that second.

“I will talk to the supervisors, I will talk to the ATP because, as I said, this is not normal. For a mistake to happen like this, yes, one or two millimeters I understand, but four, five centimeters is not normal.”

With the bounce of a ball, tennis finds itself in a quandary that cuts to the center of how folks expertise the world. When two totally different data programs disagree with one another, which one ought to they imagine?

As of 2026, Hawk-Eye ELC is used at three of the 4 Grand Slams and throughout all males’s and ladies’s tour occasions above 250 degree, together with the Madrid Open. The Australian Open changed line judges with the system in 2021, as did the US Open in 2022. Wimbledon adopted swimsuit final 12 months. The French Open has retained line judges, persevering with to make use of ball marks left within the clay to find out whether or not pictures are in or out.

Tennis balls depart marks on all surfaces, however they’re virtually invisible to the bare eye on exhausting and grass courts, though on grass, chalk can generally fly up if a ball lands on or near a line. On clay, seen traces can create pressure as two programs disagree with one another.

ELC has a margin of error of a few millimeters however ball marks on clay may be illusory. It is a “live” floor, affected by the quantity of purple brick mud in numerous components of the courtroom, climate situations and the shot’s trajectory. Tennis balls compress once they land, creating marks of all shapes and sizes that don’t at all times inform an correct story of the affect. Even programs billed as 100% correct, like Foxtenn, which makes use of cameras to show the ball’s bounce, may be affected.

Before the introduction of ELC on clay, the ATP, with some session from the WTA, paid for and commissioned an introductory video designed to elucidate these illusions to gamers and spectators.

ATP gamers have been despatched the video, and the WTA shared it on its channels and briefed its gamers about a number of the quirks of ELC on clay, however that hasn’t stopped a few of them from raging about perceived injustices, even a 12 months later. Instead of exhibiting the ball’s bounce at courtroom degree, tv broadcasts nonetheless use the top-down Hawk-Eye replay that they do on grass and exhausting courts, which doesn’t assist gamers who can see a mark that doesn’t match up.

In Madrid final 12 months, the ATP Tour’s X account even responded to a publish concerning the Zverev incident from Tennis TV, a media entity that the ATP Tour owns. The ATP stated it was unaware of any defect; Hawk-Eye didn’t reply to a request for remark.

Ball marks on clay can look totally different relying on floor situations. It’s one of many causes we launched ELC Live throughout the Tour.

Learn extra 👇 https://t.co/IeVUC9vavY

— ATP Tour (@atptour) April 28, 2025

In different eventualities, gamers have tried to let the ball marks converse for themselves. Last 12 months, two-time Grand Slam singles and blended doubles champion Victoria Azarenka had a serve referred to as lengthy in a doubles match towards Demi Schuurs and Asia Muhammad, however Schuurs and Muhammad referred to the ball mark and gave Azarenka a first serve.

This form of sporting conduct is acclaimed throughout tennis, however on this occasion it has wider philosophical penalties for officiating. If ELC is figuring out whether or not a ball is in or out, then ball marks shouldn’t be used as a part of any decision-making course of. For gamers, that requires erasing years of muscle reminiscence not from their strokes, however from their brains, by ignoring not simply the proof proper in entrance of them however the data system that they’ve relied on to know their sport.

This discrepancy has performed out for much longer for spectators. A excessive watermark for the introduction of ELC was the 2004 US Open quarterfinal between Serena Williams and Jennifer Capriati. Williams had quite a few pictures referred to as out that Hawk-Eye confirmed as clearly in — however the expertise was solely out there to tv viewers and was not used within the match.

From 2007 to 2024, Wimbledon employed a Hawk-Eye problem system, which was additionally used on the US Open and Australian Open earlier than line judges have been dropped. Players may object to calls they disagreed with, however have been solely permitted three incorrect challenges, so they may not evaluate each shut name. Viewers would due to this fact see replays of balls referred to as a method, which have been in actual fact the opposite.

In a sport that already poses so many mental challengesit was inevitable that gamers would generally turn into frazzled when advised that they cannot imagine what their eyes are telling them — even when they’ve watched an academic video that explains how and why discrepancies would possibly happen.

In 2024, Zverev advised umpires have been in charge for his two Grand Slam closing defeats in a normal draw throughout a match in Shanghai. During the decisive fifth set of that 12 months’s French Open closing, a second serve from Carlos Alcaraz was referred to as out by a line choose, however the chair umpire got here down and overruled. The Hawk-Eye tv replay dominated it out — however throughout the circa 3mm margin of error for the expertise.

Certainty may be an phantasm, particularly when the logic on the coronary heart of gamers’ arguments towards ELC is that their eyes can observe a small, yellow object transferring at over 100mph higher than a system designed to do solely this.

Taylor Fritz, the American world No. 4, stated that there may be discrepancies in how effectively gamers can regulate based mostly on their tennis background: “For someone like me, who’s not a clay-court player, stopping points and looking at marks mid-point, trying to see if it’s in or out, is so much tougher to do than someone who’s played on clay forever,” he advised reporters final 12 months in Madrid.

“So I really like how we can just play until we hear the call. If we don’t hear the calls, we know we’re playing the point. There’s no gray area, and whether it might miss a call or not, I don’t care, at least it’s consistent.”

Sabalenka, who needed a ball mark in Stuttgart, is in favor of ELC as a result of it takes away the emotional aspect of an umpire not desirous to admit to a mistake. “When it’s a little mistake or not even a mistake, I prefer to have the Hawk-Eye system than the referee because sometimes referees can be very weak (and would rather not) go there and confirm that they made a mistake,” she advised reporters.

Prominent gamers Madison Keys, Alex de Minaur and Elina Svitolina agreed that whereas there will probably be frustrations with ELC, they do not examine to the previous dynamic of disagreeing with an umpire inspecting a mark.

“I always hated when they came out and their fingers would swirl around,” Keys stated in an interview in Madrid final 12 months.

“This isn’t going to go how I want it to.”

Fils has the other view.

“We have to go back to the normal line judge and to believe in the umpire because now the umpire is not doing anything,” he advised reporters in Madrid in the identical 12 months. Players have, prior to now, railed simply as a lot towards umpires making their choices based mostly on what the gamers imagine to be the flawed mark.

With the discrepancy between ball marks and ELC manifesting on particular person pictures — and a tiny minority of the whole factors performed throughout an occasion — it’s as straightforward to neglect that gamers are being requested to fully recalibrate their understanding of the game. It is perhaps exhausting for them to erase ball marks from their minds, even when they know they are often illusory.

Świątek, who stated after beating Eala that “there’s no point” for gamers to say whether or not they favor ELC or umpires inspecting marks, seems to have discovered his model of acceptance.

“You prefer to play with umpires, but you go on court and have electronic line calling?” she stated in a information convention. “There is no time to have your mindset in that way, so I’m just going to accept whatever there is.”