The NBA, NFL and NHL have relied upon it for years when it comes to close calls and, now, it’s made its way to Grand Slam tennis. The instant replay is making its official tennis debut at this year’s U.S. Open in Flushing Meadows, New York.

During the first full day of the tournament, 11 challenges were made and three calls were reversed. Although he lost the call, American player Mardy Fish was the first to make use of the technology. Fellow American Andre Agassi also took advantage of the new system in his come-from-behind victory Monday night, reversing a key point.

Tennis player Mardy Fish (photo: AP).

According to Sports Illustrated:

The results come fast. Too fast, in fact. Tennis officials actually told the Hawk-Eye folks to slow it down a bit so the drama can build in the crowd.

So instead of posting a 3-D, computer-generated image on the stadium scoreboard in two seconds, the virtual replay appears on the scoreboard -- with "In" or "Out" -- in about eight seconds, just enough time for fans to shout their opinions.