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From BR Bullpen
- Bats Right, Throws Right
- Height 6' 4", Weight 195 lb.
 Biographical Information
Daniel Thieben debuted for the German national team in 2011 and in the minors in 2012.
Thieben made it to the Bundesliga-1 in 2010 with the Dohren Wild Farmers. He allowed six runs (two earned) and eight walks in 5 1/3 IP; at the plate, he was 5 for 23 with 4 walks. He fielded under .900, with his main position being second base. In 2011, he had a 2.01 ERA in the Bundesliga-2 for the Buchbinder Legionaere Regensburg. He participated in the MLB European Academy that year. In the 2011 European Junior Championship, he had a 1-1, 6.30 record and 6 walks in 10 innings. He got a win in relief against Russia. Starting against Italy in the Bronze Medal game, he allowed four runs in seven innings but took the loss. He then made the German squad for the 2011 Baseball World Cup, a surprise as he turned 18 shortly before the tournament began and hadn't pitched in Bundesliga-1 that year. He pitched two games in the World Cup, with wildly divergent results. Against the Dominican Republic, he was the top German hurler. Relieving Jens Cornelsen, he hit Alex Castillo but then retired Jose Campusano, Freddy Guzman, Chris de la Cruz and Willis Otanez. Max Schmitz relieved Thieben. In his other outing, he relieved André Hughes in the 7th with a surprisingly close 4-2 deficit against Cuba. He allowed singles to Alfredo Despaigne, Yulieski Gourriel and José Dariel Abreu before Dominik Hartinger relieved him; all three runners would score.
The Seattle Mariners signed him in 2011. He made his pro debut the next summer with the AZL Mariners on Opening Day, June 20 against the AZL Padres. The final pitcher in a 15-7 loss, he allowed one run and 3 hits in 2 innings.