Ruiz Jr. (33-1, 22 KO) entered the bout against Joshua as a late replacement after Jarrell "Big Baby" Miller failed a drug test.
Anthony Joshua has been told all of his past achievements will prove "irrelevant" if he can not set the record straight by defeating Andy Ruiz Jr in their rematch on Saturday.
The eagerly-anticipated rematch takes place in Diriyah in a 15,000 seater stadium, however the rain is already teeming down in Diriyah and whereas there's a small roof above the ring itself, not one of the spectators might be underneath cowl.
But Joshua then suffered a similar cut in the second round, above his eye, although he remained poised and unhurt.
The weighing ceremony concluded in Saudi Arabia, both Andy Ruiz and Anthony Joshua passed this test by weighing more than 200 pounds and everything is ready for tomorrow's fight in Saudi Arabia; however, the results of the scale left us some points that are worth mentioning. That Ruiz has come in even heavier five months later was surprising.
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Meanwhile, Joshua came in at 237.8 pounds, which is 10 pounds lighter than he was in June and the lightest he has been for any fight since 2014.
Speaking before the weigh in Boxing analyst Steve Bunce said the rumours of Joshua's weight loss was surprising.
Ruiz Jr's eyes lit up in the eighth round when he landed hard punches to the side of Joshua's head.
It was Joshua's skill and finesse (although he crashed a right hand home in the final round) that ultimately made him a two-time heavyweight champion, joining esteemed company such as Muhammad Ali, Mike Tyson and Lennox Lewis in reigning again after suffering defeat.