The UFC returns to action on Saturday in its home base of Las Vegas, and there are a pair of title fights on tap.

In the UFC 209 main event, welterweight champion Tyron Woodley (16-3-1 MMA, 6-2-1 UFC) rematches Stephen Thompson (13-1-1 MMA, 8-1-1 UFC) after their majority draw at UFC 205 in November. With Woodley entrenched at No. 1 and Thompson right behind at No. 2, a Thompson win would cause a flip-flop in the division.

And in the co-main event, with lightweight champion Conor McGregor out for a bit still, No. 2 Khabib Nurmagomedov (24-0 MMA, 8-0 UFC) meets No. 3 Tony Ferguson (22-3 MMA, 12-1 UFC) for an interim 155-pound belt.

Where else might we see movement in the rankings after UFC 209? Familiarize yourself with each division’s elite ahead of this weekend’s action.