WBA super middleweight world champion Callum Smith is expecting to see a better version of Anthony Joshua, when the British superstar faces Andy Ruiz in a rematch.

Next Saturday night, in Saudi Arabia, Joshua will challenge Ruiz for the IBF, IBO, WBA, WBO heavyweight titles.

Ruiz shocked the sport when he dropped Joshua four times to secure a seventh round stoppage.

Both fighters are making adjustments for their highly anticipated rematch.

Smith would not be surprised if Ruiz got the repeat win, but he believes Joshua will come back better this time around.

"I am very excited as a boxing fan, it's a good fight. It's tough to pick a winner, neither result would surprise me," said Smith. to Sky Sports.

"We want fights like that when you're not sure who's going to win. I'm looking forward to it and I hope Joshua sticks to a game plan to put things right and get his world titles back. I'd like to see him being a bit more switched on. I think he knows now the threat Andy Ruiz brings.

"I don't really think, deep down, he really thought he [Ruiz] could [beat him] last time. I think last time he thought it was going to be a bit of an easy night and getting the early knockdown, I think he thought the fight would be over soon after. Before he knew it he was down himself and the script was ripped up.

"Now he knows the threat he brings, I think he will be a little bit more switched on, he'll have that fear factor, and we'll see a better Anthony Joshua. Neither result would surprise me but I think Joshua will be a bit more defensive early on and wait until the fight is knocked out of Ruiz and take it to him late on and try to get a stoppage."