This was a toughie! Started off with a few helpful gimmies, like BAUHAUS (27D: Mies van der Rohe was its last director), and although my initial guess ARI was wrong for 31A: Phoenix setting: Abbr., I was right on with ASHES for 53A: Phoenix setting? Wanted "Little league" something for 35A: It has short shortstops, but it took a while to get LITTLELEAGUETEAM, partly because I had errantly entered "Itsy" instead of EENY for 38D: Kids' rhyme starter. But eventually it came, and even before it did, BASEBALLDIAMONDS (42A: Places for a 35-Across) was easy enough.
So the triple-stack took care of itself, and with it that whole middle section. And before falling asleep, I got into the NE, with it's clever COB (8D: Middle ear?) and strange OPAL (9D: It's often set in a ring) (tried what I thought was the cleverer "bout" first).
There were still large swaths undone, but this morning Frannie, with her coffee, after announcing that there were probably some that we just wouldn't get, proceeded to announce triumph after triumph. TEJANO (65A: Certain Mexican-American) led to SHOJI (48D: Japanese sliding door), and then TARZANTHEAPEMAN (4D: Much-filmed swinger) revealed YOWZA (20A: "Incredible!"), and SCOW (3D: Trash hauler), and then OSCARNODS (14A: Stars are recognized with them), and suddenly it was done.
As Frannie said, when you start a puzzle with RESTAIN (1A: Finish differently, say), you're not setting out on a very good foot, but breaking this STINGY puzzle was satisfying, and after that initial clunker, there wasn't too, too much that was objectionable. It was a little boring in parts (23A: Closest to zero / LEAST), maybe, but not in a terrible way.
p.s. Favorite clue - 58D: Pull felt on Earth (ONEG).