well people , your favourites match-ups , this are my favourites:
borg-McEnroe: classical and great quiality.
sampras-agassi: One of my favourites especially in hardcourts , the best returner against the best server!!!
federer-agassi: My other best , I love the matches against andre and roger , very agressive tennis and quality.
federer-nole: especially with the old nole , very agressive tennis for both!!! the best match-up in the last years!!
federer-hewitt: always played good matches these two.
delpo-nadal: I love pony and rafa matches , always are very exiting and with very good tennis.
coria-nalbandian: These two always played great tennis , especially in masters cup 2005 ,I miss the mago.
well these are a few.