Wrestlemania title matches if the runner up won the royal rumble
Men's Royal Rumble
Wrestlemania 9: Bret Hart (C) Vs. Randy Savage - WWF Championship
Wrestlemania 10: Yokozuna (C) Vs. Bret Hart Vs. Lex Luger - WWF Championship
Wrestlemania 11: Diesel (C) Vs. British Bulldog - WWF Championship
Wrestlemania 12: Bret Hart (C) Vs. Diesel - WWF Championship
Wrestlemania 13: Sycho Sid (C) Vs. Bret Hart - WWF Championship
Wrestlemania 14: Shawn Michaels (C) Vs. The Rock - WWF Championship
Wrestlemania 15: The Rock (C) Vs. Steve Austin - WWF Championship
Wrestlemania 16: Triple H (C) Vs. Big Show - WWF Championship
Wrestlemania 17: The Rock (C) Vs. Kane - WWF Championship
Wrestlemania 18: Chris Jericho (C) Vs. Kurt Angle - Undisputed WWF Championship
Wrestlemania 19: Kurt Angle (C) Vs. Undertaker - WWE Championship
Wrestlemania 20: Eddie Guerrero (C) Vs. Big Show - WWE Championship
Wrestlemania 21: JBL (C) Vs. John Cena - WWE Championship
Wrestlemania 22: Kurt Angle (C) Vs. Randy Orton - World Heavyweight Championship
Wrestlemania 23: John Cena (C) Vs. Shawn Michaels - WWE Championship
Wrestlemania 24: Randy Orton (C) Vs. Triple H - WWE Championship
Wrestlemania 25: Edge (C) Vs. Triple H - WWE Championship (Edge retains the WWE Championship at EC 2009 and doesn't attack Kofi and win the World heavyweight title)
Wrestlemania 26: Batista (C) Vs. John Cena - WWE Championship
Wrestlemania 27: The Miz (C) Vs. Santino Marella - WWE Championship
Wrestlemania 28: CM Punk (C) Vs. Chris Jericho - WWE Championship
Wrestlemania 29: Alberto Del Rio (C) Vs. Ryback - World Heavyweight Championship
Wrestlemania 30: Randy Orton (C) Vs. Roman Reigns - WWE World Heavyweight Championship
Wrestlemania 31: Brock Lesnar (C) Vs. Rusev- WWE World Heavyweight Championship
Wrestlemania 32: Dean Ambrose (C) Vs. Seth Rollins Vs. Roman Reigns - WWE World heavyweight Championship (Ambrose wins the title in the royal rumble match and Reigns and Rollins No. 1 contender match ends in a double count out resulting in this triple threat.)
Wrestlemania 33: Goldberg (C) Vs. Roman Reigns - Universal Championship
Wrestlemania 34: Brock Lesnar (C) Vs. Roman Reigns - Universal Championship
Wrestlemania 35: Brock Lesnar (C) Vs. Braun Strowman - Universal Championship
Wrestlemania 36: Goldberg (C) Vs. Roman Reigns - Universal Championship (Let's pretend the pandemic doesn't happen)
Wrestlemania 37: Bobby Lashley (C) Vs. Randy Orton - WWE Championship
Wrestlemania 38: Roman Reigns (C) Vs. Drew Mcintyre - Universal Championship
Wrestlemania 39: Roman Reigns (C) Vs. Gunther - WWE Undisputed Universal Championship
Wrestlemania 40: Seth Rollins (C) Vs. CM Punk - World Heavyweight Championship
Wrestlemania 41: Cody Rhodes (C) Vs. John Cena - Undisputed WWE Championship
Women's Royal Rumble
Wrestlemania 34: Alexa Bliss (C) Vs. Nikki Bella - Raw Women's Championship
Wrestlemania 35: Ronda Rousey (C) Vs. Charlotte Flair (C) - Winner take all for Both Smackdown women's championship and Raw women's Championship
Wrestlemania 36: Becky Lynch (C) Vs. Shayna Baszler - Raw Women's Championship
Wrestlemania 37: Asuka (C) Vs. Rhea Ripley - Raw Women's Championship
Wrestlemania 38: Ronda Rousey (C) Vs. Charlotte Flair - Smackdown women's championship (Ronda is the champion heading into wrestlemania instead of Charlotte)
Wrestlemania 39: Charlotte Flair (C) Vs. Liv Morgan - Smackdown Women's Championship
Wrstlemania 40: Rhea Ripley (C) Vs. Liv Morgan - Women's World Championship
Wrestlemania 41: Tiffany Stratton (C) Vs. Roxanne Perez - WWE Women’s Championship
Thoughts?