Taylor vs Davies

On 8 July Taylor faced WBC Silver champion and fellow unbeaten prospect Ohara Davies. The two had previously taunted each other on Twitter. Taylor would also be defending the Commonwealth title.^[19] Taylor dominated the fight and stopped Davies, dropping him once in round three and twice in round seven before the referee halted the contest.^[20]

Taylor vs Vázquez

Taylor defended his WBC Silver title against former lightweight world champion Miguel Vázquez on 11 November at the Royal Highland Centre.^[21] Although Vázquez' style seemed to pose problems for Taylor in the early rounds, Taylor wore him down as the fight went on. Vázquez went down in round nine from body shots, and he failed to beat the count. This was Vázquez' first stoppage loss.^[22]

On 18 January 2018 it was confirmed that Taylor would defend his WBC Silver light-welterweight title against veteran Humberto Soto on 3 March 2018, at the SSE Hydro in Glasgow.^[23] On 24 February 2018 it was revealed that Soto had sustained an injury whilst training meaning he had to pull out the fight. On the same day, Winston Campos was announced as his replacement.^[24]

Taylor vs Postol

In June 2018, Taylor fought former WBC light-welterweight champion, Viktor Postol, gaining a UD win in a twelve-round fight, meaning that he was placed in the mandatory position to fight WBC light-welterweight champion, José Ramírez. The fight took place at the SSE Hydro, Glasgow.^[25]

Taylor vs Martin

At a gala held in Moscow, Taylor selected to fight Ryan Martin in the quarter-finals. Taylor dominated the fight with Martin throwing few punches. In the seventh round, Taylor landed a flurry of punches that staggered Martin which resulted in referee Victor Loughlin stopping the fight.^[26]

Taylor vs Baranchyk

Taylor won his first world title, the IBF light-welterweight title, by UD against Ivan Baranchyk in Glasgow on 18 May 2019. Taylor scored two knockdowns in the fight.

Taylor vs Prograis

Taylor won a unification bout against WBA (Super) light-welterweight champion Regis Prograis by majority decision (MD) in the final of the World Boxing Super Series at The O2 Arena in London on 26 October 2019.^[27] The fight was shown live on Sky Sports Box Office. Two judges scored the fight 117–112 and 115–113 in favour of Taylor while the third scored it a draw at 114–114. Taylor lifted the Muhammad Ali Trophy as the winner of the 2018-19 World Boxing Super Series – Light-welterweight division along with the vacant Ring magazine title.^[28]

Taylor vs Khongsong

In January 2020, Taylor signed a promotional deal with Top Rank and an advisory deal with MTK Global.^[29] In his next fight, the Scotsman defended his titles against undefeated challenger Apinun Khongsong on 26 September 2020 at York Hall, London. Taylor did not waste any time, dropping and stopping Khongsong in the first round with a body shot. The time of stoppage was 2:41.^[30]

Taylor vs Ramírez

Taylor faced WBC and WBO champion José Ramírez on 22 May 2021, at the Virgin Hotels Las Vegas in Paradise, Nevada, for the undisputed light-welterweight title.^[31] Taylor knocked his opponent down twice in the sixth and seventh rounds, both times with his left hand, en route to a unanimous decision victory with all three judges scoring the bout 114–112 in his favour. The result meant that Taylor became the second Scotsman to be an undisputed champion (after Ken Buchanan); the first British fighter to become an undisputed champion in the four-belt era; and only the fifth man to do so after Bernard Hopkins, Jermain Taylor, Terence Crawford and Oleksandr Usyk.^[32]

Taylor vs. Catterall

Taylor's first defence of his undisputed light-welterweight title had been scheduled for 18 December 2021, against WBO mandatory challenger Jack Catterall at SSE Hydro in Glasgow.^[33] It was announced by Taylor on 21 October that he had suffered an injury, and thus the fight was postponed to 26 February 2022.^[34]

On the night, despite being knocked down by Catterall in the eighth round and being seemingly outboxed by the challenger, Taylor was handed a very controversial split decision victory, with scores of 114–111 and 113–112 in his favour, and 113–112 in favour of Catterall. According to CompuBox, Catterall landed more punches than Taylor in 11 out of 12 rounds. The challenger landed 120 of 525 (23%) total punches, and 81 of 267 (30%) of his power punches, with Taylor throwing and landing far fewer in comparison: 73 of 306 (24%) overall, and 57 of 179 (32%) on power shots.^[35][36] Former world cruiserweight champion and pundit Johnny Nelson stated, "It's decisions like this which turn casual fans off. Josh Taylor did not win that fight."^[37] The decision was labelled as "the biggest robbery in British boxing history".^[38] Irish bookmaker Paddy Power stated that they would be refunding all stakes placed by their customers on Catterall to win the bout, as it "was an absolute robbery".^[39] Despite the widespread public opinion, Taylor was defiant in his post-fight interview, saying, "I don't think there is any need for a rematch... I know I won the fight."^[40]

Taylor vs. Lopez

On April 8, 2023, it was officially announced that Taylor would defend his WBO and The Ring light welterweight belts against former unified lightweight world champion Teofimo Lopez on June 10 at the Hulu Theater in New York City.^[41] Taylor lost by unanimous decision.^[42]

Taylor vs. Catterall 2

On April 27, 2024 in Leeds, England, Taylor was scheduled to face Jack Catterall in a rematch.^[43]