Iowa State continued to be a problematic matchup for TCU: The Horned Frogs fell, 71-59, to the No. 14 Cyclones in Ames, Iowa, on Saturday. It was TCU’s fifth straight loss to Iowa State. (The Horned Frogs lost, 73-72, in the matchup last month in Fort Worth.) The Cyclones led by double digits most of the game Saturday and surged out of halftime to take a massive lead that was too much to overcome. Four of Iowa State’s first five made field goals in the second half were 3-pointers, and the Cyclones built a 44-28 lead with less than 15 minutes remaining in the game. The Horned Frogs spent the re…