Prior to his career at Wycombe Wanderers, Kretzschmar played for Southampton between the ages of 10 and 14, before being released. He went onto make his professional debut in a 1–0 victory against Morecambe on 3 August 2013. Before even making a league start, Kretzschmar opened his goal account by scoring both goals for Wycombe in their 2–1 win at Hartlepool United on 7 September 2013, having come on at half time for Nick Arnold. On 9 May 2016, it was announced that Kretzschmar would leave the club upon the expiry of his contract on 30 June 2016, along with teammates; Gozie Ugwu, Alex Lynch and Ryan Sellers.
Woking
On 15 July 2016, Kretzschmar joined National League side Woking on a one-year deal. On 6 August 2016, Kretzschmar made his Woking debut in a 3–1 home defeat against Lincoln City, replacing Ben Gordon in the 78th minute. On 20 August 2016, Kretzschmar was handed his first Woking start by manager Garry Hill in a 3–1 home defeat against Dagenham & Redbridge, before being replaced by Gozie Ugwu in the 73rd minute. On 1 January 2017, Kretzschmar scored his first Woking goal in a 2–1 home defeat against local rivals Aldershot Town, equalizing two minutes after Scott Rendell had given the visitors the lead. On 28 February 2017, Kretzschmar scored Woking's winner in their 1–0 victory against National League promotion hopefuls Dover Athletic, netting into an open goal after academy graduate, Charlie Carter had squared the ball. On the final day of the 2016–17 campaign, Kretzschmar scored in Woking's 1–1 draw with Dagenham & Redbridge, a goal which saw the Cards survival in the National League confirmed. On 23 May 2017, it was announced that Kretzschmar would leave Woking upon the expiry of his current deal in June 2017.
Hampton & Richmond Borough
On 18 June 2017, following his release from Woking, Kretzschmar joined National League South side Hampton & Richmond Borough. On the opening day of the campaign, Kretzschmar made his Hampton & Richmond debut during their 1–1 away draw with East Thurrock United, playing the full 90 minutes. A week later, he scored his first goal for the club during their 1–1 draw against Eastbourne Borough, curling home a free-kick in the 41st minute. In the month of September, Kretzschmar continued his impressive form, netting four times in five league games. On 2 December 2017, Kretzschmar netted his tenth goal in all competitions during Hampton & Richmond's league tie against Weston-super-Mare, completing the Beavers' comeback in the 79th minute to secure a 2–1 victory. On 6 May 2018, during Hampton & Richmond's National League South play-off campaign, Kretzschmar scored the winning goal during their semi-final fixture against Chelmsford City, converting a penalty in the 1–0 win. During their play-off final against Braintree Town, Kretzschmar scored the opening goal 1–1 draw, before Reece Grant equalised for Town before the break. Braintree went onto win 4–3 on penalties after extra time and were in turn, promoted back to the National League.
Return to Woking
On 13 July 2018, Kretzschmar made his return to Woking under previous manager, Alan Dowson following his switch from Hampton. On the opening day of the 2018–19 campaign, Kretzschmar marked his Woking return with the winner in their 1–0 away victory over East Thurrock United, converting a penalty with seconds remaining. Kretzschmar went onto continue his impressive scoring streak, with goals against Oxford City, Hemel Hempstead Town, Eastbourne Borough and a crucial penalty against promotion rivals, Billericay Town. On 14 November 2018, he netted his 10th and 11th goals of the season, during a thrilling 4–3 encounter with Gloucester City. On 5 May 2019, during Woking's play-off semi final against Wealdstone, Kretzschmar netted a crucial equaliser in the 86th minute and the Cards eventually went onto win the game 3–2, courtesy of a last minute effort from Jake Hyde. A week later, Kretzschmar was part of the side that triumphed over Welling United in the National League South play-off final to secure promotion back to the National League at the first time of asking. On 4 July 2019, Kretzschmar signed a new one-year deal with the Cards, following their promotion back to the National League.
Personal life
Kretzschmar was educated at Hampton School in south west London. Kretzschmar is also a renowned Football Manager player, having guided Everton to back to back Premier League title wins in the Slug Pit online game. He became widely regarded for his use of the 4231 Gergenpress, as well as his nous in the transfer market.
