Mark Hartmann

As a youngster, Hartmann had stints with Portsmouth and then at Swindon Town where he was eventually released at the end of the 2009–10 season.

Blackfield & Langley F.C.

In 2010, he joined Wessex Football League side Blackfield & Langley. On 9 November 2010, he scored a hat-trick in a 4–2 win over Alresford Town.

Manila Nomads Sports Club

After his stint with Blackfield & Langley, he moved to the Philippines where he joined Manila Nomads.

Loyola F.C.

In the 2010–11 United Football League mid-season transfer window, he joined Loyola and then scored his first goal in a 2–1 defeat to the Philippine Air Force. He scored a further seven goals in Loyola's final three games which included a hat-trick against the Philippine Navy, and a quadruple on the final day of the season in a 5–2 win. On 15 October 2011, Hartmann scored five goals in a 15–1 win over newcomer Team Socceroo in the 2011–12 United Football Cup.

Global F.C.

From 2013 to 2016, he played with Global and scored the most goals in a single season after tallying 27 goals during the 2014 UFL season.

Geylang International FC

On 10 June 2016, Geylang International announced on their Facebook page that they signed Hartmann from Global, making him the first Filipino to play in the S. League. He signed a short-term contract with Geylang that lasted until December 2016. He debuted in a match against Albirex Niigata (S) at the 2016 Singapore Cup on 1 July 2016. He made 8 goals for…

In September 2011, he joined the Philippine national team training pool and was named in the final 20-man squad for the 2011 Long Teng Cup and the provisional Philippines under-23 squad for the 2011 Southeast Asian Games. In the Long Teng Cup, he made his full international debut in the 3–3 draw against Hong Kong. He made his first appearance for the under-23 national team in the 3–1 loss against Vietnam in the opening match of the 2011 Southeast Asian Games. He scored his first and second international goal during the 2014 Philippine Peace Cup against Chinese Taipei. On 12 October 2014, Hartmann scored a super hat-trick during the first half in a 5–0 victory over Papua New Guinea. In 2024, he played for the national seven-a-side which finished second in the Asia 7s tournament.

International goals

Scores and results list the Philippines' goal tally first.

Hartmann became the first coach of the women's team of the Manila Nomads known as the Nomads StretchMarks.

Global United Football League: Winner 2014 United Football League: 2014 Golden Boot award