[2] Domestically Stalker won the 2009 British Amateur Boxing Association (BABA) championships held in Liverpool beating Scotland's Ryan Smith 10:4 in the final.

[5] The 2008 Beijing Olympic Games 'warm-up' tournament, 2008 European Union Championships in Poland was the first international tournament which Stalker meddled at, he won the gold medal at the Lightweight division, by beating Hungarian opponent Miklos Varga in the final after losing out at the 2008 European Championships in his home city of Liverpool after he lost 6:4 to Belarusian Vazgen Safaryants in the quarter-final stage.

Stalker competed at the 2009 European Union Championships in Denmark a year after winning gold at the same tournament, he once again reached the final of the competition, only to lose 10:4 to German, Eugen Burhard.

In the same year as his impressive silver medal in Moscow, Stalker captained the Great Britain team to a gold medal at the 2010 Commonwealth Games in Delhi, beating Guyana's Clevon Rock 8:1 in the first round, Sri Lanka's Kamal Sameera 4:0 in the second round, Australia's Luke Jackson 7:2 in the quarter-finals, setting up a semi-final contest again local favourite Jai Bhagwan of India, winning by the score of 10:5.

The 2011 European Championships was Stalker's first major tournament since moving up to the 64 kg light welterweight division was held in Ankara, Turkey in which he earned a silver medal, losing to Ireland's Ray Moylette in the final, having beaten previous gold medalist Hrachik Javakhyan of Armenia earlier in the competition.

[citation needed] Stalker made his professional debut on 23 February 2013 against journeyman Kristian Laight, winning all four rounds to claim a 40–36 victory.

His next outing was the next month, his first professional contest in his home city of Liverpool, on Matchroom Boxing's No Retreat No Surrender bill, in which he saw off Andrew Harris via a unanimous points decision.

Stalker's latest bout came in similar fashion to those which proceed it, a victory on all judges' scorecards, on this occasion against Hungarian Gyorgy Mizsei Jr in Blackpool's Winter Gardens in April 2013.

[citation needed] Stalker appeared in the Channel 4 documentary Knockout Scousers in July 2012 alongside Natasha Jonas and James Dickens, which followed him in his bid for Olympic qualification.