All four Grand Slam tennis tournaments will now use a 10-point tiebreaker when matches reach 6-6 in the final set.
The Grand Slam Board announced the trial move, taking effect immediately, on behalf of the Australian, French and US Opens and Wimbledon on Wednesday.
"The Grand Slam Board's decision is based on a strong desire to create greater consistency in the rules of the game at the Grand Slams, and thus enhance the experience for the players and fans alike," it said.
The Australian Open already uses the 10-point tiebreaker. The French Open, which begins May 22, was the only major to not use a deciding tiebreaker. Wimbledon had employed a seven-point tiebreaker from 12-12, and the US. Open used a seven-point tiebreaker from 6-6.