After a short period of distraction, Roches returned to his normal thinking: "I have been paying attention to Zhang Guan's serving just now, so I didn't see it clearly at all, how did this ball come over, I didn't even see the landing point of the ball clearly, whether it was out of bounds, the referee has awarded the ace ball, indicating that it is in bounds, but will the referee be wrong?" Shall I try to challenge Hawkeye? But if the referee doesn't make a mistake, I've wasted a chance to challenge. ”

The Eagle Eye system, also known as the instant replay system, is a computer system used in tennis to track the path of the recorded ball and display a graphic image of the actual path recorded, as well as to predict the future path of the ball. The entire system uses eight to ten high-resolution fast cameras to capture the trajectory of the tennis ball from all angles of the court, and then simulate it in 3D.

This system helps the referee to make a decision to determine whether the ball has gone out of bounds. And when an athlete thinks that the referee has made a mistake, they can also ask for an Eagle Eye Challenge. According to the rules, each player has a total of 3 Hawkeye challenges in each set, and if the match goes to a tie-break, one more chance will be added, if the athlete succeeds, then the challenge opportunity will remain, and if the athlete fails the challenge, the player will lose one chance.

The technology was introduced in 2001, the 2006 US Open became the first Grand Slam tournament to use the Hawk Eye, and this year's Australian Open was the first to use the Hawk Eye system. At the same time, the Eagle Eye system is not available in every stadium, only the big stadium will be equipped with the Eagle Eye system, and the small stadium will not spend money to install the Eagle Eye system.

Today, the Vodafone Stadium, where Zhang Guan and Rochestes are located, is the second largest court in the Australian Open, and of course it is equipped with the Eagle Eye system.

Just when Rochester was still hesitating whether to take the Hawkeye challenge, there was a sudden exclamation from the audience, and everyone's eyes were on the display card showing the speed of the serve on the sidelines, and Rochester also looked along and happened to see the number "208".

"A 208 km/h serve! So fast! After Rochester's heart was shocked, he immediately thought of another possibility: "Such a fast serve." The referee may not be able to see clearly. And this is also Zhang Guan's first serve in a tennis match, if the referee can't see it clearly, in order to encourage the player, most of them will be counted as bounds. In this case, I have a good chance of succeeding in challenging Hawkeye! ”

Thinking of this, Rochestes immediately signaled to the referee and asked to challenge the Hawkeye system.

A 3D simulation of the ball soon appeared on the big screen on the field, and the ball clearly landed in bounds, and it was still a finger's distance from the sideline.

"Oops, wasted a chance to challenge. Such an obvious ball in bounds, if you had paid more attention just now, you would definitely be able to see that it was in bounds. In other words, how could Zhang Guan send out such a fast ball? It's a coincidence! Rochester looked frustrated, then ready to catch the ball again.

Zhang Guan started his second serve, tossing, swinging, and hitting the ball, all in one go.

This time, Zhang Guan still used a flat serve, and Zhang Guan adjusted his serve this time, and he chose to land closer to the sideline.

"Whoosh!" Rochester has a lot more focus this time. He saw the ball flying over, and then was about to make a move to catch the ball, but suddenly realized that he was too late to make a move, and the ball must not be received again.

This time. Roches did not hesitate, since he was destined not to receive this ball, he had to carefully see whether the ball was out of bounds.

"Out of bounds!" Roches shouted in his heart. However, the ball landed in bounds.

“ACE，30-0。” The referee broke the score again. However, the display next to it also showed a ball speed of 207 km/h.

"Oh...... Oh...... Oh......" The audience was once again amazed.

"207 km, as fast as just now! The speed of two consecutive serves is more than 200 kilometers per hour! It's hard to do. Zhang Guan is just a track and field athlete. Why is the arm strength so amazing? He doesn't think he's ever worked in throwing. Is this still a coincidence? Or is this his way of serving? Roches had a vague sense that something was wrong.

"The third ball, if he still serves like he just did, let's say it's not a coincidence!" Roches glared at Zhang Guan, and Zhang Guan, who was opposite, was ready to serve the third ball.

"I've served the same ball twice in a row, so maybe Rochester has found some regularity, and this time he's going to have to go for more angles." Thinking of this, Zhang Guan directly aimed at the position of the sideline and sent out this ball.

"It's coming! Sideline! Roches rushed over quickly, but the quality of Zhang's ball was very good, and Zhang's luck was good, the ball flew out just against the sideline.

In the rules of tennis, if you press on the line, even if you just press a little, it is considered to be in bounds.

“ACE，40-0。” The referee announced the score.

"It's an inbounds! Just pressed the line, Zhang Guan's luck with this ball is really good, such a fast ball, a little bit off can be out of bounds. Zhang Guan's serve this time is the same as the previous two times, an extremely fast flat serve, and I am afraid that the ball speed will exceed 200 kilometers! Roches looked at the display board, and the ball was 204 kilometers away, which was slower than the first two balls, but it was also a serve with a speed of more than 200 kilometers.

"204 km, sure enough, as I judged before, the first two balls are not a coincidence, this is the serving method that Zhang Guan is good at! It's incredible, a serve with a speed of over 200 kilometers per hour! But speed is not enough on the serve, and now that I have figured out your routine, I can try to catch the next ball. "Rochestton was full of fighting spirit.

And Zhang Guan, who was standing opposite, silently recalled the situation of the previous goal.

"I used the same serve three times in a row, so on the last shot, Rochester had already judged where the ball would land, and if he continued to serve the same way, maybe he would be able to catch the next ball. Looks like it's time to add some spins! Zhang Guan decided to serve an upspin ball this time.

In the topspin serve, the ball is mainly topspin, supplemented by side spin, because the ball is in a state of topspin in the air, so it will present an arc flight trajectory from top to bottom, the arc of this ball is very large, and the hit rate is relatively high.

The racket in Zhang Guan's hand hit the tennis ball fiercely, making a crisp sound, and then the tennis ball spun rapidly and flew out, cutting an arc in the air.

"This ball is slower than it was just now! After three consecutive high-speed flat shots, does Zhang Guan have no strength now? I'm sure I'll be able to get it this time! Rochester immediately rushed forward, but then Roches hesitated.

"This ball seems to be out of bounds, well, the flat serve must be out of bounds, maybe you can leave it alone!" Rochester hesitated, the ball was already close to the ground, and at this time Roches also saw clearly that the tennis ball was spinning at high speed.

"No, it's not a flat serve, it's an upspin serve!" Roches secretly screamed in his heart. The topspin is easier to control than a flat shot, and if it's a flat shot, it's definitely out of bounds, but if it's an upspin ball, the power of the topspin will cause the tennis ball to fall in bounds.

Rochestes made immediate remedies, but it was too late to go up again, and the ball fell into bounds and spread out quickly, and Roches did not touch the tennis ball again.

“Love-game！” The referee announced the outcome of the game, and the word "Love" means zero points in tennis terms, while "Love-game" means winning a game without letting your opponent get any points.

Rochester did not win a single goal, and he was shaved by Zhang Guan.

Four aces in a row, and throughout the game, Roches didn't even touch the ball. (To be continued.) )

PS: The first chapter is delivered, a new week, and the last week of the month, ask for a guaranteed monthly pass and a guaranteed recommendation ticket. Thanks to the alliance leader Wuma for feeding the sheep 100,000 points, I have to go to work during the day, I can't add more red, I owe it first, and I'll make up two chapters for you on the weekend. Thank you to the book friend Red Sleeves for loving Tianxiang, smashing a mobile phone to change a place, and DFLZW 10,000 points of reward, thank you!