Current projections suggest that the Democrats would hold 48 seats after Election Day while the Republicans would hold 48. Four states are in the Toss-Up category (California, Illinois, Nevada, and Washington). All four Toss-Ups are seats currently held by Democrats. Republicans have the edge in six Democratic-held Senate seats--Arkansas, Colorado, Indiana, North Dakota, Pennsylvania, West Virginia and Wisconsin.
At the moment, no Republican-held seats appear headed for the Democratic column.