Democrats will at least have a net gain of 2 seats in 2020.

[nkpolitics1212]

Democrats will lose AL(Jones-D)-
The only Democratic US Senate seat up in 2020 from a Solid Republican state.
Democrats will gain-
AZ special(McSally-R)Kelly-D-
CO(Gardner-R)Hickenlooper-D
NC(Tillis-R)Cunningham-D
AZ,CO,and NC- Weak Republican US Senators from swing States.
If Warren(D-MA) is elected President in 2020, Republicans will briefly occupy the MA US Senate seat until the winner of the 2021 Special Election is decided. The winner is likely to be a Democrat.
ME(Collins-R) could lose if 2020 is a Democratic wave election.
Democrats can win the GA Special Election in the General Election runnoff-D

[hlthe2b]

1. From your "crystal ball" to election day...

I hope.