It was classic stubborn Fed. He's done that many times in his career. It's easy to criticize though because we only do it when it doesn't work. That approach has probably worked out for him many more times than it hasn't.
I dont think he is tanking, after seeing a few matches, Miami Tennis Courts are a little different, Djokovic double faulted in his match yesterday 3 times , Federer will adjust his game and get back on track
FWIW, I'm not surprised, and I don't even think he should be playing here, but he definitely should not lose to this guy. Kokkinakis I sort of understand. Big guy with a few weapons and all that, but Radu Albot? All respect to the guy but he's like a poor man's Schwartzman. He scrambles well and is solid enough, but he has no weapons.
I thought Albot was a dangerous first opponent. Ranking obviously on the rise (would have gotten direct entry now I think?), went through qualifying, won his first match as well. Dangerous if Roger is still finding his game on this court, and so it's proved.