Fitting, I suppose, that they should have a horse racing-related puzzle on the same weekend that American Pharoah won the Triple Crown.
And it's not just the theme clueing that was good. I enjoyed the interesting 61A: Sound you can't make in your sleep (ACHOO), 42A: Tool made to scale (ICEAXE) (no question mark!), 92A: Calculator that doesn't shut off (ABACUS), 50D: Arab city whose name is an anagram of ARABS (BASRA), and 27D: How the careful think (TWICE), to cite just some.
Some of the long Down fill is quite good. DISLEXICS is good, TRENCHANT (13D: Penetrating) is an excellent word, TEMPORARYTATTOOS (37D: Cracker Jack prizes that leave a mark) and ONEAFTERTHEOTHER (15D: In succession) are, oddly, longer than any theme fill, but both are good-looking fill, and the former is clued quite well.
There's some "glue," as it were, but not too much. Best "saving clue" for such fill - 94D: Bad "Wheel of Fortune" buy for SUSPICIOUS ACTIVITY (ANE). That's the kind of thing that makes you almost happy to enter ANE into a grid, and that's the kind of thing that makes this a very good Sunday puzzle.