In 2019, Mansell made his single-seater debut in the New South Wales Formula Race Car Championship. He also raced in two rounds of the Australian Formula 4 Championship with AGI Sport and finished all but one race in the top seven.[2] As Mansell was a guest driver he was not classified in the standings.
2020
For 2020 Mansell moved over to the United Kingdom to race full-time in the F4 British Championship, partnering Zak O'Sullivan and Matías Zagazeta at Carlin.[3] Whilst the Australian only managed to score one win at the Brands Hatch Circuit, in contrast to O'Sullivan's nine over the course of the season, he did score four more podiums, which included two third places and a second place at the final round,[4] finishing seventh in the championship.[5] Mansell won the season's Rookie Cup with a 61.5 point gap to Frederick Lubin.[6]
GB3 Championship
Mansell stayed on with Carlin in 2021, progressing to the renamed GB3 Championship.[7] The Aussie took his first win of the season in the reversed grid race at the opening round in Brands Hatch, after overtaking six cars over the course of the race.[8] His next win came at the Circuit de Spa-Francorchamps, claiming it in the first race.[9] Mansell scored a further three podiums to rank third in the standings.[10]
Mansell remained in the series for the 2022 season, partnering Vladislav Lomko and Josh Mason at CryptoTower Racing.[17] He took the opening victory of the season at the Estoril Circuit,[18] and claimed two second places at the next round in Pau, which included his only pole of the year,[19] before a run of four straight podium finishes including a win.[20] His third win came at Hungaroring in the final race.[21] Four more podiums in the next two rounds came, before a double retirement in the penultimate Monza round.[22][better source needed] The first retirement was a serious crash with Francesco Simonazzi where he was launched skyward.[23] He claimed a podium in the final round and ended third in the standings, having taken 15 podiums.[24][better source needed]
On November 28, Mansell was unveiled as a full-time driver with Campos Racing for the 2023 F3 season.[30] He then stated that he was "hungry to maximize his and Campos Racing's full potential" after his cameo appearance in 2022.[31] In Bahrain, he finished both races in 13th.[32] In Melbourne he would score his first points in ninth place after three drivers ahead were disqualified post-sprint race.[33] The following day, he would add another point in tenth following another post-race penalty for a rival.[34] Mansell failed to score points in Monaco, and was spun out by Gabriele Minì in the Barcelona sprint race.[35][36] He returned to the points in the feature race with tenth place.[37][38]
The following weekend in Austria, Mansell bagged his personal best result by finishing seventh in a hectic feature race.[39]
Silverstone delivered a breakthrough for the Australian, qualifying in fourth.[40] After a right choice to stay on dry tyres, Mansell climbed from seventh to third during the last lap, holding off a late charge from Caio Collet to achieve his maiden Formula 3 podium.[41] He followed this with a fifth placed finish in the feature race.[42][better source needed]Budapest would prove to be slightly challenging for Mansell in tyre management, finishing sixth in the sprint but overcooked his tyres in the feature race saw him slip to 11th.[43] The weekend at Spa-Francorchamps started on the wrong foot, qualifying 23rd and being involved in an incident in the sprint race where he received a puncture.[44] In the feature race, a bold gamble on wet tyres saw him jump up the order rapidly, and was up to second after leader Paul Aron pitted. He would narrowly miss out on the win to Taylor Barnard.[45] Mansell ended his season in Monza by scoring seventh and eighth places.[46][better source needed] Mansell finished 12th in the standings with 60 points and two podium finishes.[47][48]
In October 2023, Mansell joined ART Grand Prix for post-season testing at Jerez.[49] He then participated in the Macau Grand Prix with the French team,[50] finishing 16th in the main race.
[51]
At the Formula 3 end of season awards night, Mansell picked up the Best Comeback of the Year following his exploits in the Feature race in Belgium where he stormed his way forward from 23rd to second at the chequered flag briefly mounting a challenge for the race win.[52]
2024
Mansell would switch to ART Grand Prix for his second full Formula 3 season.[53] Qualifying eighth for the Bahrain opening round,[54] a difficult sprint race saw him slump out of the points. However, a strong opening lap jumped him to second by lap 5, where he remained for his first podium of 2024.[55] Mansell took two tenth places in his home event in Melbourne, despite fighting for the lead in the sprint race.[56] Mansell endured a surprisingly uncompetitive round in Imola where he failed to score points,[57] but bounced back with a brilliant second in Monaco qualifying.[58] He was eliminated in a first lap incident after Arvid Lindblad swiped across him in the sprint race, but he returned to the podium with another second place in the feature.[59][60]
Mansell soared to his first F3 pole in Barcelona.[61][62] After narrowly missing out on points in the sprint race, he led the feature until lap 5 where Arvid Lindblad overtook him, leading to Mansell settling for second place yet again.[63] Mansell tussled for the lead in Austria with teammate Nikola Tsolov, but made an error by lifting too early during the safety car signal dropped him to third place.[64] In a hectic feature race, Mansell made an impressive charge towards the front, even contending for the podium positions as he placed in fourth place.[65] However, he was forced to endure a point-less weekend in Silverstone as a track limit penalty demoted him from fifth to 12th in the sprint, and unpredictable weather saw him on the wrong strategy in the feature.[66]
In Hungary, he qualified eighth, and an overtaking masterclass in both races secured fifth and fourth place, hauling him into title contention.[67] However, a messy Spa-Francorchamps round followed, as he qualified down in 20th and was unable to score points in both races, even being penalised in the feature for taking Arvid Lindblad out.[68][69] Qualifying seventh for the season finale in Monza, Mansell had high hopes for the sprint race,[70] but his title hopes as he stalled on the formation lap, and later had a messy race, finishing 22nd.[71] He would play a huge role in the title in the feature race, as he overtook Trident driver Leonardo Fornaroli for third on the penultimate lap to hand the title to Gabriele Minì, but the former passed him into the last corner on the last lap to snatch it away from Minì.[72] Minì would later be disqualified due to a "technical nonconformity", promoting Mansell to the podium places.[73]
Mansell finished fifth in the championship with 112 points, one pole and five podiums, as well as helping ART Grand Prix finish third in the championship.[74]
Shortly after the F3 season finale, Mansell made his Formula 2 debut with Trident from the Baku round onwards, replacing Roman Staněk.[77] Having earned reverse-grid pole for his first race by virtue of qualifying 10th, he finished eighth after leading the early stages and making late contact with Gabriel Bortoleto in a battle for fifth place, before claiming 10th and the final point in the feature race.[78] Mansell qualified down in 20th in Qatar, but a well-timed pit stop during the feature race allowed him to gain time on rivals ahead and he eventually finished in sixth place.[79][80] A tough Yas Marina round left him scoreless with a double 16th place.[81] Mansell scored ten points throughout his three-round stint and finished 25th in the standings.[82]