To me, an ace, as implied by the term itself, is a guy that you figure you are likely to win the games he pitches. On the days when he "has it," opponents' runs are few and far between, and he pitches deep into the game. No pitcher has it every time out, but he does more often than not. When he's really on, he's pretty much untouchable. On the days when he doesn't have his A game, he has enough tools, savvy, and mental makeup to give you a QS and a good shot at the win. When an ace is in a jam, he has the ability to bear down on a hitter, make tough pitches in tough situations, and get out of trouble. On the rare days when he just doesn't have it, even if he gets lit up early, he probably still finds a way to get through 5 innings and save some wear on the bullpen. Also, an ace has stamina. He's still pitching well as the pitch count gets into the 90s and even over 100. That's my take on what an ace is, and I think Jimmy met the criteria in 2017.