Seven tournaments from the six largest tours over the next three weeks could shape the field for the Masters, and perhaps pave the way for the largest gathering at Augusta National in more than 50 years. Augusta National invites the top 50 from the final world ranking of the year, and then the top 50 one week before the Masters. Among those on the bubble are former PGA champion Keegan Bradley, hanging on at No. 48, and Presidents Cup player Cameron Smith at No. 52.