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Hawk-eye technology has proven to be a big plus for tennis, removing the randomness of bad line calls. Fans and players can concentrate on the match, knowing a blown line call won't decide a big point, and in turn decide a big match. I believe that had hawk-eye been around in John McEnroe's era, he would have won several more significant titles because he would have had recourse for bad calls instead of just getting lost in a temper tantrum and then losing the match.