Everyone agrees that the most physically challenging position is behind the dish, hands down. And from a mental standpoint, no doubt the most difficult position is on the bump. But...IMHO, the shortstop is the winner here!
Catcher's aren't expected to hit! If they do, it's a Major bonus. Most catchers get a break, and rest 1-2 games per week, and in many cases share the load. Let's face it, there aren't many Johnny Bench's, Mike Piazza's, and Ivan Rodriguez's out on the diamond. Buster Posey may be moved to another position when he returns from injury? Heck, even Mauer has been working out at 1B.
I'd give the nod to starting pitchers, but they're only on the field every 4-5 days...a closer on a team that is in the race would make my top three because of the added pressure, but again, the closer is not on the field every day.
Now, if we look back 15-20 plus years ago, shortstop was a "Defense First" position. Like today's catcher's, if you could hit, it was a bonus! The modern day shortstop is now expected to play great defense and swing the bat. If they hit, but struggle on defense, they're moved to another position. If they play "Gold Glove" D, but struggle at the plate...they become a utility player and/or a back up late inning defensive replacement. Shortstop is the Most Difficult Position...and BTW, my son is a RHP/OF.
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