Career: Compiled career records of 39-25 in singles and 38-29 in doubles ... owns a 10-8 career singles record in ACC competition and an 11-9 mark in doubles ... has five career match-clinching victories ... defeated four ranked opponents in singles and two in doubles ... reached career-high rankings of No. 77 in singles and No. 44 in doubles in 2010.
2010-11 (Junior): Concluded the year with a 6-5 singles record and a mark of 5-3 in conference play ... went 5-3 from the No. 5 singles position while also seeing action at the No. 6 spot ... delivered a match-clinching victory in Duke's 7-0 win over Boston College ... also clinched the Blue Devils' 4-0 victory over No. 37 Virginia Tech in the ACC Tournament ... went 1-0 in postseason play with a win over Virginia Tech's Lucas Oliveira in the quarterfinals of the ACC Tournament ... posted a ledger of 8-7 in doubles, teaming with Fred Saba for a mark of 5-4 in dual match play at the No. 2 and No. 3 positions ... the duo also combined for a 3-1 record in ACC doubles action ... secured the doubles point for Duke in a 7-0 victory over Wake Forest ... went 2-1 in the NCAA Tournament with Saba, registering victories at the No. 3 spot against George Washington and Maryland ... also teamed with Cale Hammond at the No. 3 doubles position for a mark of 3-2 in ACC play ... paired with Hammond for an 8-6 victory over Alex Domijan and Steven Rooda of top-ranked Virginia in conference action.
2009-10 (Sophomore): Tallied a 19-15 singles record with a 5-5 mark in the ACC ... played primarilty at the No. 4 position in dual match play, posting a record of 10-8 and also saw time at No. 3 ... clinched Duke's 4-0 victory over VCU in the first round of the NCAA Tournament and would go on to win in the second round against North Carolina ... claimed three wins over ranked opponents, including two straight set victories ... had a 17-16 overall record in doubles, teaming with Alain Michel for a 13-11 mark in dual matches ... the duo played mostly at No. 3 in the lineup and had a 5-6 ACC record ... picked up two ranked wins in doubles, including an 8-5 win against No. 19 Jean Anderson and Daniel Whitehead of Texas ... recorded wins in doubles in both the first and second rounds of the NCAA Team Championships ... started the spring with a singles ranking of No. 77 and reached a high of No. 44 in doubles on March 16 ... posted a 6-4 record in singles and 3-3 doubles ledger during the fall ... won five straight singles matches with four coming in the ITA Carolina Regional to advance to the quarterfinals ... defeated No. 80 Carlos Alvarez of Clemson in straight sets in the round of 32 ... two of his three doubles losses came to top 25 teams.
2008-09 (Freshman): Got off to a hot start in the spring, winning his first six matches and posting an 11-1 record before suffering an injury that would cause him to miss the rest of the season ... also had an 11-4 doubles record in the spring and was on a four-match winning streak before his injury ... went 8-1 in singles during dual match play with a 6-1 mark at No. 4 and one win at both the No. 2 and 3 spots ... ended the year with a 14-6 singles record and 13-6 doubles ledger ... claimed a match-clinching 6-1, 6-4 win over No. 98 Emil Lindgren of VCU for his first career win over a ranked opponent ... also clinched Duke's 4-2 win over No. 31 Rice ... recorded a 3-4 record in singles and 5-3 ledger in doubles during the fall ... named to the ACC Academic Honor Roll.
Prep: Attended Van der Meer Tennis Academy in Hilton Head, S.C. after finishing school at Ubbo-Emmius Gymnasium in Leer, Germany ... ranked as high as No. 1 in the TennisRPI rankings in both 2006 and 2007 ... climbed to No. 2 in 2006 and 2007 on the college recruiting lists ... competed in International Tennis Federation (ITA) and achieved career-high rankings of No. 1,456 in singles on Nov. 5, 2007 and No. 1,370 in doubles on Oct. 15, 2007 ... has one singles and one doubles victory on the ITF Men's Circuit ... posted records of 20-11 in singles and 16-12 in doubles on the ITF Junior Circuit ... was the German singles and doubles champion in the U-16 division in 2005 ... won back-to-back Jerry Simmons ITF Junior Circuit tournaments in Baton Rouge, La. and Destin, Fla. in 2006 ... also made the finals in doubles in Baton Rouge ... took third place in the U16 European Doubles Championships in 2005 ... member of the Germany Junior David Cup U-14 and U-16 teams.
Personal: Born Joern Torsten Wietoska on July 5, 1989, in Hannover, Germany ... son of Hans-Juergen and Brunhild Wietoska ... has one brother, Christian and one sister, Imke.