Häner made his debut for the German national team in 2005.[3] At the 2012 Summer Olympics, he competed for the national team in the men's tournament, where they won the gold medal and the 2016 Olympics where Germany won bronze.[4][5] On 28 May 2021, he was named in the squad for the 2021 EuroHockey Championship and the 2020 Summer Olympics.[6] He scored four goals in the tournament as they won the silver medal after they lost the final to the Netherlands after a shoot-out.[7] After the 2020 Summer Olympics he retired from playing hockey.[8]
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Martin represented East Grinstead during the 2008/2009 season in which East Grinstead men were crowned Premier League Champions - winning the national top-flight for the first time since winning the inter league playoff final during the 1980s. Martin also played for East Girnstead Indoor in that season, which was the first in a run of 8 Indoor Premiership titles.
