His hard work is resulting in a lot of free throws. He's got 40 free throw attempts in just the last four games, which is sensational. I took a look at the best four-game FTA stretches in the Bo Ryan era, and here is the result:
1) K. Taylor, 43: OSU, NU, Pur., IL in 2006-07 (50 over 5, 56 over 6)
2) Hughes, 41: Duke, GSU, GB, Marq. in 2009-10
3) J. Taylor, 41: MSU, Mich., Pur., Neb in 2011-12 (but had 0 against Michigan! And 42 over 5.)
4) Harris, 40: Minn, NU, Iowa, OSU in 2003-04 (0-1 against Iowa, 47 over 5, 57 over 6)
5) Harris, 40: first 4 games of 2003-04 (45 over 5)
6) Tucker, 40: Pitt, Iowa, MSU, MN 2005-06 (had 49 over 5)
Most of these performances were by point guards, probably largely inflated by late-game free throws. Alando in 05-06 is the only similar stretch by a Badger forward. And he was a starter who was getting a lot more minutes than Hayes.
Hayes's effectiveness will presumably go down a little bit as opposing coaches get more tape on him. But so far he has been an absolute beast.