I'm just watching Novak/Tsonga now... The first 2 sets Novak looked good early with breaks in each, but then Tsonga broke back and it was pretty much completely even through those 2 sets, and only the tie break setting them apart to get 1 set each.. Although Novak was having a meltdown at the end of 2nd and start of third, looked like Tsonga was going to run away with it, but the Novak just demolished him with Tennis that i'd put against Fed or anyone else left...
But 4th set his health done him in with bad stomach and he's stuggling to even win a point..

So 2 even sets going each way, and 2 demolition sets going each way, the 5th could be a firecracker..