32
• Mark Calcavecchia, 2001 Phoenix Open
• Paul Gow, 2001 B.C. Open
Three other golfers have reached 31 birdies:
31
• John Huston, 1998 United Airlines Hawaiian Open
• Phil Mickelson, 2006 BellSouth Classic
Steve Stricker, 2010 John Deere Classic
Note: Steve Stricker and Jhonattan Vegas both make this list - in fact, Stricker leads it - if we include the first four rounds of 90-hole tournaments. Stricker made 34 birdies in the first four rounds of the 2009 Bob Hope Classic; and Vegas made 32 birdies in the first four rounds of the 2011 Bob Hope Classic.
Source: PGA Tour
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