In Greek mythology, the city of Troy fell because of Achilles’ heel — a single weakness that changed everything. No. 4 seed Nebraska will try to find a similar weakness Thursday when it faces No. 13 seed Troy in the first round of the NCAA men’s basketball tournament in Oklahoma City. For both programs, the stakes are the same: a chance to secure the first NCAA Tournament victory in school history. “The team’s won 20 games in five straight years, so they’ve got a winning culture and we’re going to have to be on point,” Nebraska coach Fred Hoiberg said. “It’s a great time of year. It’s a fun time of year. I’ve talked to our guys about enjoying it, but at the same time, this is a business trip for us.” Nebraska enters the tournament with a 26-6 record and finished 15-5 in Big Ten play, tying for second in the conference. The Huskers matched the school record for wins in a season and set a program record for conference victories, earning their highest NCAA Tournament seed since 1991. ...