Here I compared their slam match AO 2010 with Masters. I had made a thread for it
So was watching highlights of random young Murray vs Fed, ended up watching couple of sets from these matches (AO 2010, Toronto 2010).
Murray's ability to use varieties is so underrated. People say Federer doesn't let anyone have rhythm, I will claim that young Murray never let Federer have rhythm. Federer was always miscalculating/ misfiring against murray due to this fact. Murray persistently refused to go away and would drop brilliant returns on a dime while retrieving like 80% of Federer's would be winner. For Federer ,young Murray was mystery, with young Djokovic he had an easy plan : outhit Djokovic or hit it out. But unlike Djokovic, Murray refused to indulge in "Who finds a more acute angle or blasts a winner first" pattern of a typical Federer-young Djokovic match , he would keep running side to side retrieving, while asking different passive aggressive questions , no wonder it drove Federer mad.
But in slams, it was a completely different match up. Federer used to come in with a " Nah not getting into your chess games, I amma blast you off the court, if not that I just pull a impossible shot outta thin air" mentality. And this worked, unlike in bo3s, Federer's attacking approach basically broke Murray's will in USO 2008 and AO 2010. In USO 2008 Federer went off with his FH in the first few games just to intimidate Murray. It feels like Fed basically cut down the errors on aggression like 50% from Murrderer bo3 matches in bo5
The most astonishing thing is the same pattern of play that won Murray points in bo3 would mostly turn on its head in bo5. The same shots Federer misses in BO3 he, for some godforsaken reason ,ends up making in slams. Federer's focus goes up like a level or two in slams.
Case in point There is one point in Toronto final second set, where Murray keeps hitting to Federer BH, till Federer runs around and hits a half baked inside out FH, Murray promptly fires BHDTL.
In AO 2010 F, Murray at one point does the same thing, keeps going to Federer BH, and of course Federer ain't having the time of his life with that, but unlike in Toronto, on the 4th ball to his BH, but Fed goes for a extremely acute angled winner of the Backhand.
2010 AO F (Highly recommended to watch this , effing high quality in first 3-4 minutes)