A good rise for sure, I hope he keeps it up!
I currently would see good chances for him to play with Haas in singles at the beginning of next season for the first round in Davis Cup if the German team does not choose clay. You never know what Kühnen selects, but Becker makes a mentally more stable impression than Kohlschreiber, Mayer or Phau, has a better form than Schüttler anyway and his better serving should help him for an indoor tie. But I understand it would be quite a big task. Being no member at all, ranked very low until half a year ago and then suddenly play singles against a strong opponent like Croatia