WWE shared the news for the second match during the throwback SmackDown episode. 

Rey Mysterio will face Dolph Ziggler in singles action. WWE announced Rey and Dominik Mysterio vs. Ziggler and Robert Roode for the SmackDown Tag Team Titles at the WrestleMania Backlash pay-per-view on May 16.

As of now the other match we know is Rollins vs Cesaro. 

JUST ANNOUNCED: Two #SmackDown legends collide on the Road to #WMBacklash when @reymysterio goes one-on-one with @HEELZiggler!

You won't want to miss a special throwback edition of SmackDown TONIGHT at 8/7c on @FOXTV!https://t.co/PdyXgSrVsk pic.twitter.com/A2N6JmCfaK

, WWE (@WWE) May 7, 2021