The procedure for awarding waiver claims is different depending on the type of waivers and the time of the year.
PROCEDURE FOR AWARDING OF WAIVER CLAIMS (TYPE OF WAIVERS):
1. For Optional Assignment Waivers, Outright Assignment Waivers, and Outright Release Waivers (but NOT for Trade Assignment Waivers): If a player is claimed by only one club, that club is awarded the claim. If more than one club makes a claim, the club with the lowest winning percentage (regardless of league) either from the previous season (beginning on the day after the conclusion of the MLB regular season through the 30th day of the MLB regular season) or on the day the player clears waivers (beginning on the 31st day of the MLB regular season through the last day of the MLB regular season) is awarded the claim. If two clubs with the same winning percentage make a claim, the club in the player's own league is awarded the claim. If two clubs from the same league make a claim and they are tied in the standings, the club with the lowest winning percentage from the previous season is awarded the claim. If the clubs are still tied, standings from two years back (or three years back, four years back, etc) are used to break the tie.
2. For Trade Assignment Waivers (only): If a player is claimed by more than one club, the club in the player's own league with the lowest winning percentage is awarded the claim, even if that club has a higher winning percentage than the club or clubs making a claim from the other league. So a player placed on Trade Assignment Waivers must essentially be "waived out of his own league" before he can be assigned to a club in the other league. But again, this ONLY applies to Trade Assignment Waiver claims.
PROCEDURE FOR AWARDING OF WAIVER CLAIMS (TIME OF THE YEAR)
1. During the off-season and up through the first 30 days of he MLB regular season, the previous season's MLB standings are used to determine waiver claim priority.
2. Beginning on the 31st day of the MLB regular season through the conclusion of the MLB regular season, the MLB standings as of the date the player clears waivers are used to determine waiver claim priority, with the previous season's MLB standings only used to break ties.
RESTRICTION ON MAKING WAIVER CLAIMS:
A club is not permitted to make a waiver claim and then trade the player to another club if the purpose or effect of the claim was to prevent a third club from being awarded the waiver claim. (A waiver claim that is judged by the MLB Commissioner to have been made for this purpose will be revoked).