Joshua - whose International Boxing Federation, World Boxing Association and World Boxing Organisation titles will be on the line - weighed in on Friday at 17 stone 8 pounds (111.5 kilograms), whilst 39-year-old Povetkin tipped the scales at 15st 12lbs.
Joshua, 28, admitted to feeling under "tons of pressure" as he returns to the scene of arguably his greatest triumph, an 11th-round stoppage of former champion Wladimir Klitschko past year.
Joshua also earned around £20 million for his clash with Joseph Parker in March but his payday will increase even more if he gets through Povetkin unscathed and agrees to fight the victor of Wilder and Tyson Fury for the WBC title. Povetkin (34-1, 24 KO's), who fought on the undercard, scored a brutal fifth-round KO over David Price.
Saturday is the first of a two-fight deal at Wembley and Joshua said he felt at ease.
"We both showed that against Klitschko, dug deep and stayed in there". The one loss came at the hands of Klitschko back in 2013.
Tiger feels close to ending drought after achieving Tour Championship goal
For his career, the only two-time FedEx Cup champion has one victory (2007) and three runners-up (2000, '04 and '05) at East Lake. "I didn't know how many tournaments I'd play in and, next thing you know, here I am in the Tour Championship", Woods said.
"And I'm expecting the same type of fight because..." At whatever level I was at, I have always been able to get to the top.
The fight, which will be broadcast in over 160 countries, is an attempt by Joshua to retain his titles while Povetkin seeks to return to the top of the category. Anthony is a very strong fighter but I am just as strong.
Both undefeated heavyweights have signed their contracts, and they've also agreed to go on a promotional tour for the fight. When I fought Klitschko, I was much weaker and in worse shape than I am now. "I work alongside people who have the same strengths". "It's time to just put on a performance".
"This is not new to me, this feels like home", he said ahead of a bout that pits two former Olympic boxing champions against each other, Joshua having won gold at London 2012 and Povetkin at Athens 2004.