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

All of the Democratic held US Senate seat up for re-election in 2020 except AL(Jones-D)
1/36)RI(Reed-D)
2/37)MA(Markey/Kennedy-D)
3/38)OR(Merkley-D)
4/39)NJ(Booker-D)
5/40)DE(Coons-D)
6/41)IL(Durbin-D)
7/42)NM(Lujan-D)
8/43)VA(Warner-D)
9/44)NH(Shaheen-D)
10/45)MN(Smith-D)
11/46)MI(Peters-D)
Democrats need to win 5 Republican held US Senate seats up for re-election in 2020.
12/47)CO(Gardner-R vs Hickenlooper-D)
13/48)AZ special(McSally-R vs Kelly-D)
14/49)NC(Tillis-R vs Cunningham-D)
15/50)MT(Daines-R vs Bullock-D)
16/51)KS(Kobach-R vs Bollier-D)
ME(Collins-R vs Gideon-D) is tough to predict.
Collins-R is less popular now then she was before Trump got elected. Collins won her 2002,2008, and 2014 re-election campaigns by a landslide margin.