The two fighters had been due to fight each other in Las Vegas in May before the middleweight bout was cancelled after Alvarez failed a drug test.
The 37-year-old won 28 of his 32 bouts including 26 knockouts.
Fury only got going in the fourth round and his brief exhibition of power convinced Seferi's corner to pull out the Switzerland-based Albanian before the start of the fifth round.
Santa Cruz improved to 34-1-1 with 19 career knockouts by winning on all three judges scorecards, 115-113, 116-112, 117-111 at the Staples Center arena.
Shelly Finkel, one of Wilder's co-managers, told ESPN that negotiations with Joshua's camp are ongoing, with the possibility of a fight held towards the end of the year.
Judges in Fresno, California, awarded the verdict to Ancajas by scores of 119-109, 119-109 and 117-111 as the southpaw improved to 30-1-1 while Sultan fell to 14-4.
The 36-year-old tested positive for dexamethasone, which is banned by the World Anti-Doping Agency for in-competition use.
Stevenson, a 40-year-old southpaw, kept the title after two judges scored the bout 114-114 and the third saw Jack as a 115-113 winner in the title bout at Toronto.
The Filipino legend has won world titles across an unprecedented eight different weight classes, but critics question his ability to fight at the top of his game due to his age.
Alvarez announced on Tuesday that he has enrolled in the year round Voluntary Anti-Doping Association (VADA) drug-testing regime.
The Lionhearts are coming with a fully packed squad, including two medalists from the recent Gold Coast Commonwealth Games.
Ukraine's Lomachenko survived a sixth-round knock-down to set a record in claiming a world title in a third weight division in just his 12th professional fight.
Golovkin ended the fight with a vicious series of right and left combinations that floored the heavy underdog Martirosyan.
The 32-year-old reached the milestone in the fifth round as Leroy Estrada failed to recover from an upper cut.