Democrats are likely to regain control of the US Senate in 2022 than 2020.
In 2020, Democrats need a net gain of 3 to 4 seats to regain control of the US Senate.
Democrats are going to hold onto every Democratic held seats up in 2020 except AL.(Jones-D vs the non Moore-R) and pick up AZ(McSally-R vs Kelly-D) and CO(Gardner-R vs Hickenlooper-D) +1D
Democrats need to win ME(Collins-R vs Gideon-D),NC(Tillis-R vs Cunningham-D) and GA(Perdue-R vs Tomlinson-D).
In 2022, If we have a Democratic President. The most vulnerable Democratic held seats up in 2022 is AZ(Kelly-D vs Ducey-R) and NH(Hassan-D vs Sununu-R). Democrats will hold onto CO(Bennet-D) and NV(Cortez Masto-D). Democrats will hold onto every Democratic held seat up in 2022 including AZ,NH,NV, and CO. and pick up IA(OPEN Grassley-R)- Scholten-D, NC(OPEN Burr-R) McCready-D, PA(Toomey-R) Lamb-D, and WI(OPEN Johnson-R) Barnes-D.