The Senate looks like a jump ball. Here are the 10 seats that will decide the majority

Pennsylvania Democratic U.S. Senate nominee John Fetterman, left, has so far maintained a polling edge over Republican nominee Dr. Mehmet Oz, as Democrats try to take over the swing state's seat. (Nate Smallwood/Getty Images; Bill Clark/CQ-Roll Call Inc. via Getty Images)

At this point, control of the U.S. Senate next year looks like a jump ball.

Four months ago — the last time we wrote about the top 10 seats most likely to change hands — Republicans were growing confident they would win the chamber.