2020 US Senate Election- US Senate seats Democrats are definitely going to win.

We get a Democratic President- Warren-D who gets replaced by a Republican who will serve until the 2021 special election.
35/36)RI(Reed-D) and DE(Coons-D) are from Solid Democratic States and are running unopposed.
37/38/39/40)MA(Markey-D),NJ(Booker-D),OR(Merkley-D),and IL(Durbin-D) are in solid Democratic States with sacrificial lamb GOP challengers.
41/42/43/44)NM(OPEN Udall-D/Lujan-D),VA(Warner-D),MN(Smith-D),and NH(Shaheen-D) are in Democratic leaning Battleground States with sacrificial lamb GOP challengers.
45)CO(Gardner-R)weak Republican incumbent loses to Hickenlooper-D a top tier Democratic challenger in a Democratic leaning Battleground state.
46)MI(Peters-D) defeats James-R by a narrow to high single digit margin.
47/48)AZ special(McSally-R vs Kelly-D) and NC(Tillis-R vs Cunningham-D/Smith-D) are weak Incumbents in purple States.
49)ME(Collins-R) is more weaker now than she was in 2008 and ME is a Democratic leaning Battleground state. The real question is how Gideon(D) the likely Democratic nominee performs.
50)IA(Ernst-R) disapproval rating is higher than approval rating. The real question is does the Democratic nominee perform better or worse than Braley-D did in 2014.
51)MA(Democrat wins the 2021 Special Election to complete Warren-D's term.)
US Senate races that Democrats could make interesting.
52)AL(Jones-D) if Moore-R becomes the Republican nominee again.
53)KS(OPEN Roberts-R) if Kobach-R is the Republican nominee.