I was tempted to introduce kriek´s name, but IMHO, he was really, talent wise, one of the best players of his generation, with a record only overcome by true greats.Powerful, nimble, very solid, great hands at the net and at the baseline, one of the fastest all time players, his mind was probably not so much focused on tennis ( or, as sometimes happens, an excess of talent diverses it from the real goal).
If that had been the case, he probably would be one of the all time greats by now."almost" won any tournament that counts and was a terror to anyone if inspired.