However , the 10 - point tiebreaker format was not adopted at the four Grand Slams tournaments , except in mixed doubles at the French and US Opens .
The WTA Tour followed suit in mid-2007 .
The 10 - point tiebreaker format was not adopted at the four Grand Slams tournaments , except in mixed doubles at the French and US Opens .
The WTA Tour followed suit in mid-2007 .