John Lineker (born June 12, 1990)[1] is a Brazilian Muay Thai kickboxer and mixed martial artist currently signed to ONE Championship, where he is the former ONE Bantamweight MMA World Champion.

[16] However, Harris was forced out of the bout and Lineker instead faced promotional newcomer José Maria.

As a result, he surrendered 20 percent of his purse to his opponent and the bout was changed to a 129-pound catchweight affair.

[25] Lineker was expected to face Ian McCall on November 8, 2014, at UFC Fight Night 56 as the co-main event.

[26] However, just hours after both fighters had successfully made weight, it was announced that Mccall had been pulled from the event due to a blood infection.

[34][35] Lineker was expected to face Cody Garbrandt on February 21, 2016, at UFC Fight Night 83.

[36] However, Lineker pulled out of the fight during the week leading up to the event citing illness and was replaced by Augusto Mendes.

[49] Lineker was scheduled to face Jimmie Rivera on December 30, 2017 at UFC 219, replacing the injured Dominick Cruz.

[50] On December 24, it was reported that Lineker was forced to pull from the fight due to tooth infection.

[60] The bout with Sandhagen was rescheduled and eventually took place on April 27, 2019, at UFC Fight Night: Jacaré vs.

[62] Lineker was scheduled to face Rob Font on June 22, 2019, at UFC Fight Night 154, replacing injured Cody Stamann.

[66] Lineker made his promotional debut against Muin Gafurov at ONE Championship: Dawn Of Valor on October 26, 2019.

[68] Lineker made his sophomore appearance in the organization against Kevin Belingon at ONE Championship: Inside the Matrix 3 on November 13, 2020.

[73] Lineker was scheduled to face reigning champion Bibiano Fernandes for the ONE Bantamweight Championship at ONE: X on December 3, 2021.

[80] Lineker was scheduled to make his first bantamweight title defense against Fabrício Andrade at ONE on Prime Video 3 on October 21, 2022.

[81] At weigh-ins, John Lineker missed weight, coming in at 145.75 lbs, .75 pounds over the limit.

Lineker was stripped of the ONE Bantamweight World Championship and the bout proceeded at a catchweight with only Andrade being able to win the title.

[82] During the beginning of the third round, Andrade accidentally connected with a strike to the groin of Lineker, who could not continue.

[83] A rematch between Lineker and Andrade for the vacant ONE Bantamweight World Championship took place on February 25, 2023, at ONE Fight Night 7.

[90] Replacing Sage Northcutt on short notice, Lineker faced Shinya Aoki in a openweight bout on January 28, 2024, at ONE 165.

[92] Lineker was scheduled to make his Muay Thai debut against Liam Harrison on January 13, 2024, at ONE Fight Night 18.

[97] He won the fight via knockout in the first round and this win earned the Performance of the Night bonuses.

[99] At the weigh-ins, both fighters failed multiple hydration tests and the bout proceeded at a catchweight of 150.75 pounds.