Ben Shelton will advance past Learner Tien at the National Bank Open on August 12. Shelton will lean on his defending champion form after beating Joao Fonseca 6-3, 7-6 (3) in the last round and will stop 20-year-old Tien, who reached the quarterfinals by defeating Thiago Agustin Tirante 6-4, 6-4. T…