Here’s how September roster rules work in 2020

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The 2020 trade deadline was a hard deadline, meaning no trades can be made in September, even via waivers.

The only way for a team to add a player outside the organization in September is to claim him via outright waivers after he is designated for assignment, kind of like the Reds did two weeks ago with Nick Williams.

That was how the Phillies acquired reliever Jared Hughes last September. Over the last year, they've also added relievers Robert Stock, Trevor Kelley, Reggie McClain and Deolis Guerra via waivers.

This is relevant with so many players designated for assignment around the trade deadline. Players such as:

  • Indians OF Domingo Santana
  • Braves 1B Matt Adams
  • Marlins LHP Adam Conley
  • White Sox INF Ryan Goins
  • Cubs INF Hernan Perez
  • Cubs C Josh Phegley
  • Phillies C Deivy Grullon
  • Phillies RHP Reggie McClain
  • Reds RHP Pedro Strop
  • Mets OF Juan Lagares

To be eligible for the postseason, a player must be on his team's active roster by 11:59 on Sept. 15.

The regular season ends on Sept. 27. The first round of the playoffs takes place from Sept. 29 to Oct. 2. 

The NL playoff field will seed the division winners 1-3, the second-place teams 4-6 and the teams with the next two best records 7-8.