LONDON, Great Britain - The Grand Slam Board, the board of the four Grand Slam chairmen and executives as well as ITF President David Haggerty, announced this week that several new rule changes will come into effect over the next two years.

From the Australian Open 2018, a shot clock will be utilized in between points, and the time permitted increased to 25 seconds.

Main draw players forced to withdraw through injury after the Thursday preceding the start of the tournament, but before start of play, will receive 50% of first-round losers' prize money - with the replacement Lucky Loser taking the other half of the purse.

Barbara Schett shakes hands with Venus Williams after beating the No.2 seed 6-4, 6-4 at Roland Garros in 2001 (Getty)

From 2019, Grand Slams will also revert to 16 seeds from the current 32 - going back to the system that was in place until Wimbledon 2001. That year, both the Australian Open and Roland Garros had seen the No.2 seed pitted against the World No.25 in the first round, with Lindsay Davenport beating Jelena Dokic in three sets in Melbourne and Venus Williams falling to Barbara Schett in Paris.

The 32-seed system has seen little effect on unseeded players progressing to the latter rounds of Slams. Over the 10 Slams preceding the switch to 32, there were 19 unseeded players who reached the quarterfinals or better - the same number as in the last 10 Slams under 32 seeds.

Indeed, the 16-seed system could still lead to an all-seeded quarterfinal lineup (such as the 2001 Australian Open and 1998 US Open). Meanwhile, over the 16 years of the 32-seed system, there have been 18 unseeded semifinalists, two unseeded finalists (Justine Henin at the 2010 Australian Open and Roberta Vinci at the 2015 US Open) and even four unseeded champions (Serena Williams at the 2007 Australian Open, Kim Clijsters at the 2009 US Open, Jelena Ostapenko at Roland Garros in 2017 and Sloane Stephens at the 2017 US Open).