The 1998 winner did not compete in 1999 becaseu the course did not suit him.
But in 1998 Pantani not only won both the TDf and Giro but also picked up the KOM in hte Giro and if I remember correctly barely missed it in the TDF.
Never finished the TDF after that and his best result inthe Giro was 14th. He had a couple of DNFs in both the Tour and Giro.