Bayliss spent much of his childhood in Warialda, in north-west New South Wales. His father Warren was a baker, and his mother Lorraine drove a local school bus part-time. The family lived opposite the local high school, and by age 10 Bayliss was an accomplished motocross rider, frequently riding through the bushland surrounding the town. The family relocated to Taree when he was approximately 11 years old.
As a teenager his enthusiasm for racing waned and he began an apprenticeship as a spraypainter at Joe Berry's, commuting by bicycle. Passing a motorcycle dealership on his daily route, he eventually took out a loan to purchase a Kawasaki ZXR 750 and commenced racing. He won the first race he entered on the bike and performed well in subsequent events, deciding at age 26 to compete in the Australian Supersport championship.
After finishing runner-up in the Australian Supersport championship in 1995, Bayliss moved up to the Australian Superbikes series, finishing third in 1996 and second in 1997. That year he received a wildcard entry for the Australian 250 Grand Prix, riding for the Dutch Arie Molenaar Suzuki team. Despite riding a significantly underpowered machine, he finished sixth, having been as high as third through the final corner.
That performance earned him a ride in the British championship with the new GSE Ducati team in 1998. His first win came in race 11 at Oulton Park, followed by another at race 20 at Silverstone, but a large number of crashes and mechanical failures prevented a serious title challenge. In 1999 he beat Chris Walker to the British title.
Bayliss began the 2000 season in the US AMA Superbike Championship, but was called in to replace Carl Fogarty in the Superbike World Championship after Fogarty was injured at Philip Island. Despite missing the first three rounds, he earned sixth overall in the championship and won two races.
In 2001, Bayliss took his first World Superbike victory in race 8 at Monza, accumulated six race wins across the season, and defeated reigning champion Colin Edwards to claim his first world title. He clinched the championship at Assen when Edwards broke down, though he crashed in race 1 of the final meeting and suffered a broken collarbone.
The 2002 season began in dominant form, with Bayliss breaking the then-record for most race wins in a season, but Edwards' consistency turned the advantage. The title was decided at a thrilling final round in Imola: Bayliss crossed the line first in race one, but lost on aggregate after the opening portion of the race was red-flagged due to an oil leak from Peter Goddard's Benelli. The season was also hampered by a collision with teammate Ruben Xaus at Brands Hatch and a mid-season frame change that Bayliss felt compromised the bike's handling until the team reverted to the original specification at Imola.
Both Bayliss and Edwards moved to MotoGP in 2003. In Ducati's first MotoGP season the bike was competitive, with Bayliss taking three third-place finishes and finishing sixth overall. He briefly led at Philip Island, Brno and Welkom, and narrowly lost the rookie of the year award to Nicky Hayden. Teammate Loris Capirossi took the team's first MotoGP win at the Circuit de Catalunya.
2004 was difficult: Bayliss finished only 14th in the standings as the bike struggled with handling despite strong straight-line speed. He was subsequently released from the factory Ducati squad. For 2005 he joined Sito Pons' Camel Honda team, but a severely broken arm meant he was unable to compete in the final six races. Bayliss described MotoGP machinery as too inflexible and rigid for his riding style.
Following his 2006 Superbike success, Ducati offered Bayliss a one-off entry in the final MotoGP race of the year at Valencia, replacing the injured Sete Gibernau. Bayliss qualified second and led the whole race, which ended in a Ducati 1–2. This was the first time any rider had won a race in both the Superbike and Grand Prix world championships in the same year, and the first by a reigning champion. His victory was somewhat overshadowed by the dramatic events involving Valentino Rossi and Nicky Hayden that ultimately determined the 2006 MotoGP title.
Returning to the Superbike World Championship in 2006, Bayliss led the points table after the first five rounds with seven consecutive race wins. He clinched the title at Imola with a fifth-place finish in Race 1 — sufficient as James Toseland did not win — then won Race 2 to cement the championship.
In 2007, at Donington Park, Bayliss crashed at Coppice corner on lap six of the first Superbike race. His right hand was momentarily caught beneath the motorcycle, requiring the surgical removal of a testicle and of the intermediate and distal phalanges of his little finger. He finished that season fourth overall.
In 2008, riding the new Ducati 1098, Bayliss won Race 1 at the season opener at Losail in Qatar — Ducati's first win with the 1098 — and also won both races at Philip Island. He clinched the championship by finishing third at Magny-Cours, then sealed it by winning Race 2, his 50th World Superbike victory. He took a double victory in his final World Superbike meeting at Portimão, retiring after the season.
Bayliss tested a Ducati 1198 at a private session at Mugello in May 2010. In February 2015, he was called to replace the injured Davide Giugliano at the Phillip Island opener, riding the 1199 Panigale R.
He transitioned to touring car racing, co-driving for Triple F Racing in the V8 Supercar series alongside their regular driver Dean Fiore at the Phillip Island 500 and Bathurst 1000. The team broke an alternator before the Phillip Island race and did not finish the Bathurst 1000. He also raced as a co-driver in the 2013 and 2014 Australian Porsche Carrera Cup Championship.
In 2018, aged 49, Bayliss came out of retirement with his DesmoSport Ducati team to contest the Australian Superbike Championship (ASBK), finishing the season third. For 2019 he switched to race number 32 and took delivery of the new Ducati Panigale V4R, but a crash in Free Practice at the opening round left him with a finger injury on his right hand, and he elected to extend his break to have metalwork removed from his foot. A bicycle accident in 2021 resulted in further injury.
In August 2025, Bayliss reportedly suffered serious injuries after a riding incident, including a broken collarbone, seven ribs, and a punctured lung. Prior to this incident he was already managing an injury to his left ankle from a motocross accident.
This article is based solely on the supplied corpus. No external sources were consulted; claims that could not be substantiated against the corpus were omitted under the drop-the-claim rule.
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