Federer ties Lendl's record of 28 consecutive 4th rounds in Slams, excellent achievement. Another win has him break Connors 27 consecutive QF's in entered Slams. Then at Wimbledon, a 4th round would break Lendl's record of 28 4th rounds.
That's what I initially thought but now notice that Lendl's record for consecutive 4th rounds in Slams is actually 29. And if you extend that to consecutive slams participated then it is 34 (although there were 3 Slams within this period in which he did not enter).
I really hope he can break Connors' consecutive QF record in slams entered - even more impressive as Rog's feat would be consecutive.