2018,2020,and 2022 US Senate election- Democrats will have net gain of seats each cycle.
2018(+1D to +5D)
Democrats pick up AZ,NV,TN,TX and MS Special in the November Runnoff.
Democrats could lose FL,IN,MO,and/or ND.
2020(+1D to +10D)
Democrats pick up AZ special,CO,and NC
Democrats could lose AL and/or MS if they win it in 2018 special.
If 2020 is a strong Democratic Wave Election year, Democrats could pick up
AK- if Begich-D or Berkowitz-D runs.
GA- if Democrats carry GA in the 2020 Presidential Election.
IA- if Democrats carry IA in the 2020 Presidential Election.
KY- if Beshear-D or Chandler-D run.
LA- if Mary or Mitch Landrieu-D or Bel Edwards-D run.
ME- if Collins-R retires or loses in the primary.
MS(assuming Hyde Smith-R wins in 2018 and loses in the primary in 2020) if Hood-D or Childers-D run.
MT- if Bullock-D or Schweitzer-D runs.
TX- if Julian or Joaquin Castro-D run.
2022
If Democrats occupy the White House- Democrats hold onto every Democratic held seat up in 2022 including CO,NV,NH and AZ- assuming Democrats win seat in 2020 special election and pick up PA and WI
If Trump or Pence occupy the White House- Democrats pick up AZ-assuming there was no special election in 2020,FL,GA,IA,NC,OH,PA,and WI.