Wich tournaments has challenges (hawk eye)?

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French Open officials, despite numerous calls for the installation of Hawk-Eye, refuse to use it, saying that clay still allows players and the chair umpire the chance to see a close mark themselves making Hawk-Eye redundant.
But it’s not just the French who see no use in the system. No other clay court events this year, including those in the U.S., used Hawk-Eye either and there’s been no indication that any of them will soon.
Despite this, ESPN and the other networks covering the French Open and other clay events in Europe, use an unofficial version of the technology to replay close calls, but only for the benefit of viewers watching online or on TV....Show more

French Open never had the Hawk eye which is pretty disgusting really!
I mean one can trust technology more than the Umpires(In Tennis atleast)..
FO has always been like that,but there is the Hawk eye in the other GS!!

I don't know much about all the other tournaments(Small slams,etc),but I guess almost all the tournaments have the Hawk eye!

FO is weird sometimes!:O...Show more