Clemson
I didn't see any losses vs top 10 Clemson teams we played them in 2000,2012 and 2013 and FSU won all 3 including 2 30+ point beatdowns
FSU wasn't top 10 last season and neither were top 10 in the 2011 game Clemson won.
I'm looking right now checking from 1992 till current FSU record in top 10 matchups
1992- L vs Miami, W vs Florida
1993- W vs Miami, L vs Notre Dame, W vs Florida, W vs Nebraska (NC game)
1994- T vs Florida, W vs Florida (Sugar Bowl)
1995- L vs Florida, W vs Notre Dame (Orange Bowl)
1996- W vs UNC,W vs Miami, W vs Florida, L vs Florida (NC game)
1997- W vs UNC,L vs Florida, W vs Ohio St (Sugar Bowl)
1998- W vs Florida, L vs Tennessee (NC game)
1999-W vs GT,W vs Florida, W vs Va Tech (NC game)
2000-L vs Miami, W vs Clemson, W vs Florida, L vs Oklahoma (NC game)
2002-L vs Miami, L vs Notre Dame
2003-L vs Miami, L vs Miami (Orange Bowl)
2004-L vs Miami, W vs Virginia
2006-W vs Miami
2011- L vs Oklahoma
2012- W vs Clemson, L vs Florida
2013- W vs Clemson, W vs Miami, W vs Auburn
2014-W vs Notre Dame, L vs Oregon
I only found one loss vs the ACC (04 Miami)