2011 Banja Luka Challenger  The 2011 Banja Luka Challenger was a professional tennis tournament played on clay courts. It was the tenth edition of the tournament which was part of the 2011 ATP Challenger Tour. It took place in Banja Luka, Bosnia and Herzegovina between 12 and 18 September 2011. The following players received wildcards into the singles main draw:  The following players received entry from the qualifying draw:   Blaž Kavčič def. Pere Riba, 6–4, 6–1   Marco Crugnola / Rubén Ramírez Hidalgo def. Jan Mertl / Matwé Middelkoop, 7–6(7–3), 3–6, [10–8]