Arizona - The storm came in a hurry, as Isaac "Royal Storm" Dogboe blasted out Hidenori Otake via TKO at 2:18 of the opening round to retain his WBO super bantamweight world title. (photos by Mikey Williams).

Dogboe (20-0, 14 KOs) knocked down Otake (31-3-3, 14 KOs) down twice in the round, and a follow-up flurry forced referee Chris Flores to call a halt to the bout.

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Dogboe won the title with a thrilling 11th-round TKO against Jessie Magdaleno in April. This time, he had a shorter night at the office.

In the ESPN-televised six-round special attraction, Mikaela Mayer (7-0, 4 KOs) knocked down Edina Kiss in the first round en route to a third-round TKO after Kiss did not come out for the fourth round. Mayer, a 2016 U.S. Olympian, is 4-0 in 2017.

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In other action - Super Featherweights: Robson Conceicao (9-0, 5 KOs), unanimous decision, 8 rounds, Edgar Cantu (7-5-2, 1 KO). Scores: 80-71, 80-71, 80-71.

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