8-0 vs. RoddickRoddick and Hewitt easily. He is 17-0 against them in slam. Murray, Safin and Wawrinka also would have won slams if it wasn't for Federer stopping them.
The only threats to Federer ( outside the Big 3) consistently in slams would have been Nalbandian and Agassi. He's had an excellent record against everybody else throughout the course of his career
8-0 vs. Hewitt
4-1 vs. Safin, that 1 win coming in AO'05 SF in 5-sets.
3-1 vs. Agassi, that 1 win coming in USO'01 well before Federer became Federer.
Only loss to Safin in AO'05 was relevant. No wonder Federer was regarded immortal during that period.
Meh, Murray would probably have won Wimbledon'12 final; that's it, because that final was played under closed roof and because he beat Federer at Olympics on the same court a month later. Murray's biggest problem at Wimbledon, "surprise surprise," is Rafa; he won only 1 set vs. Rafa in 3 matches played at Wimbledon.
Murray had and will have no chance vs. Djokovic at AO (0-5 at AO), Murray had and will have no chance vs. Rafa at RG, and Murray would lose to many players at USO other than Federer. Only Djokovic is Wawrinka's bunny and Wawrinka can lose to any player at any slam. Safin was a headcase and could have lost to any player other than Federer.