anyone know where to find the

biggest reverse split seasons by pitchers?

Unless I'm misreading the question ... Just filter to the starting pitcher of your choice. Choose Righties and filter by Bal vs L descending, then reverse it for Lefty pitchers.

sorry. I meant outside of the current ATG data base/player pool.. trying to find some new cards to nominate 4 New Card Additions! thanks

There's a way to search this on Baseball-Reference. But it says: "Subscribe to Stathead Baseball for full results." It's $8 per month. Here's the page where I began using WHIP and platoon splits (but I don't subscribe, so it only gave partial results). And, I'm not sure if I applied the search criteria correctly, it's kinda confusing:

https://stathead.com/baseball/split_fin ... onMatch=is

Also says:
NEW: Sample Searches for learning more about the power and flexibility of Stathead. • Game data is only available for the American League, National League, and Federal League. Data runs from 1901 to present for regular season data, 1933-Present for the All-Star Game, and 1903-Present for the Postseason. Please see our data coverage page for details.