Yes some expenses can be written off. The prizes jackets, cues, watches, or anything else must be claimed at MSRP (set by the manufacture) as per IRS guidelines regardless if these items were bought for less or donated. Yes other leagues and tours give out 1099's for any winnings or prizes valued over $599. Even local tournaments are suppose to give them for winnings over $599 or if these tournaments have break pots were the balls or pot are worth more than $599.
You can dispute the value of the prizes however if the items are new then the IRS generally will go with the MSRP.
Thanx for reply.