Frithjof Kleen
| Personal information | ||||||||||||||||||||||||
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| Nickname | Frida | |||||||||||||||||||||||
| Nationality | Germany | |||||||||||||||||||||||
| Born | 25 June 1983 Berlin, West Germany  | |||||||||||||||||||||||
| Height | 189 cm (6 ft 2 in) | |||||||||||||||||||||||
| Weight | 110 kg (243 lb) | |||||||||||||||||||||||
| Sailing career | ||||||||||||||||||||||||
| Class | Keelboat | |||||||||||||||||||||||
| Club | Norddeutscher Regatta Verein | |||||||||||||||||||||||
| Coach | Alan Smith | |||||||||||||||||||||||
Medal record 
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Frithjof Kleen (born 25 June 1983 in Berlin) is a German sailor, who specialized in two-person keelboat (Star) class. He represented Germany, along with his partner Robert Stanjek in the Star class at the 2012 Summer Olympics, and also captured a silver medal at the 2011 ISAF Sailing World Championships in Perth, Australia. Kleen has also been training throughout most of his sporting career for the North German Sailing Regatta (German: Norddeutscher Regatta Verein) in Hamburg under his personal coach Alan Smith.
Kleen qualified as a crew member for the German squad in the Star class at the 2012 Summer Olympics in London by placing second and receiving a berth from the ISAF World Championships in Perth, Western Australia. Teaming with his partner Robert Stanjek in the opening series, the German duo recorded a net score of 70 points throughout the entire race, but came up short for the medal podium with a satisfying sixth position against a fleet of sixteen boats.