As was the case yesterday, my last two entries were merely educated guesses: The U of RUR (46D: 1921 play for which the word "robot" was invented), and the A of TARAS (13D: Gogol's "____ Bulba.") The former, I had put in immediately with LAOTZU, but removed the U after I read the down clue, because I know that the English spelling of the great philosopher's name can vary. And, not being especially enlightened myself, ARHAT was only very dimly on the horizons of my memory. Still, nice outcome. :)
The rest of the puzzle pretty much flew by like a Wednesday. The '70s sports references (ZAIRE, ALI, SANTO) were gimmies for this old man. I had "arkS" briefly at 1D: Bible supporters, often (PEWS), and TiNt at 37D: Shade (TONE), but those might have been my only two missteps, and they were quickly corrected.
The nine-stacks in the NW and SE were strong. POSTERIZE, WHATSMORE, and ARISTOTLE were my favorite three entries. EXCUSEYOU (35D: "How rude!") was fun, and NUDESCENE (43A: Hot take?) was cute. Also, "Real stunner," with no question mark, was a good clue for TASER.
Not much to bark at today. Just a smattering of PARA, IPO, and ASTI -type things. Overall, a bit quick, but a fun solve.