Masters was born in
Newcastle, New South Wales, Australia. After winning the New South Wales Under-16 championship in four consecutive years, and also the Australian under-16 title, he moved into senior competition in 2007. He also represented Australia in the
FIM Youth Gold Cup in 2006 and 2007. In 2009, he was signed by
Premier League team the
Somerset Rebels for the 2010 season and in 2010 won the New South Wales under-21 title. In September 2011, Masters won the
Premier League Riders Championship at Sheffield's
Owlerton Stadium. He finished the season as Somerset's number one, but missed the end of the season after being banned for 28 days by the
Speedway Control Bureau due to comments made on
Facebook about a referee. In November an SCB court of enquiry gave Masters a suspended 12-month ban and a 2,000 fine. Masters was a member of the
Australian Under-21 team that finished second in the
2012 Under-21 World Cup Final in
Gniezno, Poland. In December 2012, he won the
New South Wales Championship at the
Loxford Park Speedway in Kurri Kurri. He was later signed for the 2013 Premier League season by
Edinburgh Monarchs, but failed to get a work permit to ride in the UK. In March 2014, Sam eventually joined the Edinburgh Monarchs. Together with
Max Fricke, they won the
Premier League. Knockout Cup, League Cup and Pairs titles. On 29 November 2014, Masters won the 2014/15
Victorian State Championship at the
Undera Park Speedway defeating fellow Edinburgh riders
Justin Sedgmen and Max Fricke. He then went on to finish second behind a runaway
Jason Doyle in the four round
2015 Australian Championship, winning the Rd.3 "A Final" at Undera Park, while finishing second to Doyle in the "A Final" in the fourth and final round at Loxford Park. Masters got his first start in the
Speedway Grand Prix World Championship series in
2015 when he was given the Wildcard spot for the 12th and final round of the season to be held at the
Etihad Stadium in Melbourne (where he finished 12th with 5 points). He was involved in a heated clash with triple World Champion
Nicki Pedersen at the end of Heat 8. Unhappy that Pedersen had squeezed him close to the wall on the back straight, the two exchanged words at the pit gate. Then as Masters was walking back to his pit he was confronted by Pedersen's mechanic Marek Hu. More words were exchanged and Masters punched Hu before being led away. For his actions Masters was fined by the
FIM. He was part of the Edinburgh team that won the League titla again in 2014 and the
Premier League Four-Team Championship final, which was held on 1 October 2015, at the
Media Prime Arena. On 14 January 2017, Sam Masters won his first
Australian Championship when he took out the 4-round series. Masters scored 58 points over the 4 rounds, including winning Round 2 at
Olympic Park in
Mildura, to defeat
Justin Sedgmen (55) and
Davey Watt (50). Masters was crowned the champion at his home track, the Loxford Park Speedway in
Kurri Kurri located south of Newcastle. In 2022, he rode for the
Wolverhampton Wolves (he joined Wolverhampton in 2016) in the
SGB Premiership 2022 and for the Edinburgh Monarchs in the
SGB Championship 2022. Also in 2022, he won the
Championship rider's title for the second time and recorded the highest Championship average riding for Edinburgh but suffered a broken collarbone on Wolves duty. In 2023, he signed for Wolves for the 7th consecutive season, competing in the
SGB Premiership 2023, taking the captaincy role and earning a testimonial meeting. He also joined
Oxford Cheetahs in the
SGB Championship 2023. He re-signed for Oxford for 2024 and moved from Wolves (following their closure) to Leicester in the Premiership. He was made captain for Oxford Cheetahs in the absence of
Scott Nicholls for the start of the 2025 season. In 2025, he helped Leicester defeat
King's Lynn to win the
Knockout Cup. == World Final Appearances ==