The PGA Tour cut rule has long been the top 70 players and ties after 36 holes head to the weekend for the final two rounds.
Then, in 2008, the PGA Tour introduced its secondary cut, the MDF rule, which kicks in when 78 or more players make the cut. After the third round, a cut is again made down to the number nearest 70 for the final round, done in the name of reducing the size of the final-round Sunday tee sheet.
However, 10 years into having the MDF rule around, the players are reportedly sick of it, and they want it gone. That's why the PGA Tour players are working with the Tour to explore changing the PGA Tour cut rule.
According to Golf Channel reporting, the PGA Tour 36-hole cut rule could change from the top 70 and ties down to the top 65 and ties, which is the European Tour 36-hole cut rule. By reducing fields to the top 65 and ties, the PGA Tour cut rule would then eliminate the need for a secondary, 54-hole cut.
In 2014, the PGA Tour eliminated the secondary cut in the first two FedEx Cup playoff events, The Northern Trust and Deutsche Bank Championship. However, with the playoffs reduced to three events starting in 2019, it's unclear if just one event will have a 54-hole cut or how it will work.
There's no guarantee the PGA Tour players will aim to change the cut rule after completing their study. However, it seems the idea of not getting four full rounds after getting through the first two is too much to handle.