Marc Janko

Janko began the 2008–09 season scoring five goals in the first two matches. On 16 November 2008, he became the all-time club leader for goals scored in one season for Salzburg. His 25 goals in less than half a season, surpassed previous record-holder Oliver Bierhoff, who scored 23 during the 1990–91 season. Janko continued his scoring streak with a four-goal performance against league rival Altach. On 6 December 2008, he surpassed Toni Polster as the all-time half-season scoring champion by scoring 30 goals in 20 matches.

Due to his 39 goals scored in the 2008–09 season, he became the topscorer in all European leagues during the year. His success caught the attention of several English Premier League clubs and Celtic. However, he signed a new contract with Red Bull on 30 January 2009, which would have kept him in Salzburg until June 2013.

Janko made his debut for Austria in a May 2006 friendly match against Croatia and earned his second cap in October that year against Liechtenstein. In 2009, he scored one of Austria's two goals against Lithuania on 10 October 2009. Four days later, he scored Austria's lone goal against France.

Though there were rumors and speculation that Janko would sign with a different club, he stayed with the Red Bulls. In 21 matches that season, Janko scored 12 goals which currently put him in second place in the Bundesliga behind teammate Roman Wallner. His best performances were a four-goal effort against FC Kärnten on 4 October, and a pair of goals scored against Josko Ried on 13 February 2010.

Janko was also an integral part of the Salzburg team that enjoyed success in its pool play in the UEFA Europa League. He had a strong performance against Standard Liège on 19 February 2010, scoring his side's two goals in a 3–2 loss in the first tie of the round of 32.

Janko signed a four-year contract with Dutch club Twente on 21 June 2010 and was given the number 21 shirt, previously worn by fellow Austrian Marko Arnautović. Twente paid Red Bull €7 million for Janko's signature.

Janko scored his first goal for his new club on 21 August 2010, his side's first in a 3–0 win over Vitesse in the third match of the Eredivisie season. In the club's next Eredivise match, Janko scored a brace and notched an assist as Twente defeated Utrecht 4–0.

Janko scored four goals for Twente in a 5–0 rout of Heracles on 19 January 2011, while also providing an assist for Luuk de Jong's goal. On 23 January, he scored both goals for Twente as they came from a goal down to defeat Groningen. On 8 May 2011, Janko scored the winning goal of the 2011 KNVB Cup final against Ajax in the 117th minute to seal a 3–2 victory.

In the 2011 Johan Cruyff Shield on 30 July 2011, Janko scored from the penalty-spot as Twente defeated reigning Eredivisie champions Ajax 2–1 to lift the cup. In the first match of the 2011–12 Eredivisie season, Janko scored the match's only goal as Twente defeated NAC Breda. Janko scored twice on 28 August, scoring Twente's third and fifth goals as they defeated Heerenveen 5–1. On 29 September, he scored twice to lead Twente to a first victory in the UEFA Europa League, a comfortable 4–1 win over Wisła Kraków.

On 30 January 2012, it was announced that Janko would sign for Porto. On 31 January, Janko was officially unveiled as a Porto player and was given the number 29 shirt, joining in a €3 million move and signing a contract until June 2015. On 5 February, he scored his first goal for Porto against Vitória de Setúbal in the Taça de Portugal, a 2–0 win.

On 28 August 2012, after just half a year at Porto, Janko signed for Turkish club Trabzonspor for a €2.4 million transfer fee. He made his debut for the club five days later, coming on for Paulo Henrique in the second half of a 0–1 loss to Gaziantepspor. Janko finally scored his first goal for Trabzonspor on 19 November, opening the scoring for the club in their 2–1 victory over Orduspor.

Janko scored his first goal of the 2013–14 season on 24 October 2013, scoring Trabzonspor's goal in a 2–0 victory over Legia Warsaw in the UEFA Europa League group stage. On 4 December, he scored against Balıkesirspor in the fourth round of the Turkish Cup, but the goal was not enough as Trabzonspor fell to a 1–3 defeat. He scored just his second league goal during his time in Turkey on 23 February 2014, scoring the match winner against Kayserispor. At the end of the season, Janko was released from his contract, allowing the forward to move to a new club on a free transfer.

On 31 July 2014, Janko was announced as Sydney FC's new marquee signing for the 2014–15 A-League season, on a one-year deal, meaning his wages were permitted to be paid outside the league's salary cap. On 30 August, he scored his first goal for Sydney during the final of the inaugural Townsville Football Cup in a 2–0 win against Brisbane Roar. On 24 October, he scored his first A-League goal, against Brisbane Roar in a 2–0 victory. His 35-yard shot bounced into the top left corner to give Sydney a 1–0 lead. Janko scored his next two goals in the form of a brace against Melbourne City, after having turned down the opportunity to play for the Austria national team against Brazil. He scored another two goals in Sydney's 5–1 rout of Central Coast Mariners on 24 January 2015.

On 26 May 2015 it was announced that Janko would be leaving Sydney due to difficulties with attending league matches and international duty.

On 25 June 2015, Janko joined Swiss side Basel on a free transfer, signing a one-year deal. He played his debut for Basel on 25 July 2015 in the away match at the Letzigrund against Grasshopper; he also scored his first goal for Basel in the match, which ended 3–2 for his side. Under trainer Urs Fischer, Janko won the Swiss Super League championship at the end of the 2015–16 and 2016–17 Super League season. It was Basel's eighth-straight title and 20th overall.

On 6 June 2017, Janko signed a two-year contract with Czech club Sparta Prague.

On 6 February 2018, Janko signed a contract with Swiss club FC Lugano.