As a Federer fan:
Federer VS Davydenko Rotterdam SF - Davy was playing some great tennis but Fed fought back and prevailed.
Federer VS Del Potro Dubai SF - 2 tight sets and Fed winning 6 straight points at the end to seal it
Federer VS Harrison Miami R64 - Was in destructive mode at the start, though choked a bit at the end was a really routinerer.
Federer VS Raonic Madrid R32 - how to S&V on clay
Federer VS Seppi Rome QF - God mode, didn't miss a single first serve until set point
Federer VS Haas Halle F - Great tennis from the old German
Federer VS Fish Cinci QF - Again great quality match from both players
Oh add Janowicz VS Simon Paris SF - First set was mind blowing