Democrats guide to regaining control of the US Senate in 2020-

35 Democratic held US Senate seats are not up for re-election in 2020
minus 2 Democratic US Senators from states that have a Republican Governor are running for POTUS
Sanders(VT) and Warren(MA). If either of them are on the 2020 Democratic ticket, their successor will be appointed by Governor Scott(R-VT) and Governor Baker(R-MA). The incoming Republican US Senators from VT and MA will lose in the 2021 special election.
US Senate seats up for re-election in 2020 that Democrats will win are
1)RI(Reed-D)34
2)MA(Markey-D)35
3)DE(Coons-D)36
4)NJ(Booker-D)37
5)OR(Merkley-D)38
6)IL(Durbin-D)39
7)VA(Warner-D)40
8)NM(Lujan-D)41
9)MN(Smith-D)42
10)NH(Shaheen-D)43
11)MI(Peters-D)44
12)CO(Hickenlooper-D)45
13)AZ special(Kelly-D)46
14)NC(Cunningham-D)47
15)ME(Gideon-D)48
16)GA special(Warnock-D)49
17)GA regular(Tomlinson-D)50
18)IA(Greenfield-D)51