I think it would be very low. 1. There is no paper trail so it is your word vs. the IRS and they really have nothing on you and it is only $10,000. I mean some people win jackpots everyday on $5 video poker for $20,000.
Just keep records. But, if you file as professional get a book on it. You might be able to deduct health care even Obamacare, mileage, flights, and hotel rooms. With your standard deduction your income will probably be zero.
Regular businesses you can go below zero, but poker you can only go to zero. You can't use losses in poker to offset other income.
But filing is not bad, you get deductions, and if you play a tournament and win big you get to keep it. Then you can offset it by playing $500 tournaments and if you lose, you deduct it and all the travel and meals.
https://www.amazon.com/Turn-Your-Pok.../dp/0977486206
It also depends a lot on the State you live.