Junior speedway

Sissis was born in Adelaide, South Australia, but grew up in the small town of Virginia, some 40 kilometres (25 miles) north of Adelaide. Sissis started racing junior motocross before joining the Sidewinders Under 16 Speedway Club in the northern suburbs of Adelaide at just 9 years of age. He went on to win the 2008 and 2009, 2011 Australian Under-16 Individual Speedway Championships, and finished second to Brady Kurtz from New South Wales, in the final of the 2010 championship.

Red Bull MotoGP Rookie Cup

Sissis then chased his Grand Prix dream and went on to ride in the 2010 Red Bull MotoGP Rookie Cup. A best placing of 6th in the first race of Round 3 at Assen saw him finish 13th in the championship. He again rode in the championship in 2011, scoring three wins (Jerez race 2, Assen race 2 and Mugello race 1) and finished 2nd in the championship, only 9 points behind Italian Lorenzo Baldassarri.

It was during 2011 that Sissis got his first Grand Prix start when he rode an Aprilia 125cc at the Malaysian Grand Prix. After qualifying 30th he had a steady race and finished in 20th.

Moto3 World Championship

In 2012, Sissis has joined the Red Bull KTM Ajo team for the Moto3 World Championship, replacing the 125cc World Championship. After qualifying 9th for the first race at the Losail International Circuit in Qatar, Sissis got a good start and was 2nd on the first lap before slowly dropping back and eventually finishing 7th.

The high point in Sissis' racing career to date was his third-place finish at his home Grand Prix at Phillip Island on 28 October 2012. Sissis led home a competitive pack behind the two leaders, his position only secured in the final seconds of the race, by only 0.054 seconds from fourth placed Alex Rins. This result was his only Grand Prix podium.

Return to speedway

In December 2014, Sissis decided on a return to speedway, signing to ride in 2015 for Sheffield Tigers in the British Premier League.^[1]

In his return to speedway, Sissis finished 10th in the 2014/15 South Australian Solo Championship held at the Gillman Speedway in Adelaide on 28 December 2014.^[2]

In May 2016 he rejoined the Sheffield Tigers team.^[3]

Red Bull MotoGP Rookies Cup

Grand Prix motorcycle racing