- 254 - Tommy Armour III (64-62-63-65), 2003 Valero Texas Open
- 255 - *Steve Stricker ((65-67-61-62), 2009 Bob Hope Classic
- 256 - Mark Calcavecchia (65-60-64-67), 2001 Phoenix Open; Russell Henley (63-63-67-63), 2013 Sony Open; Phil Mickelson (60-65-64-67), 2013 Waste Management Phoenix Open
- 257 - Mike Souchak (60-68-64-65), 1955 Texas Open; Tiger Woods (64-63-64-66), 2007 Tour Championship
*Stricker's total came in the first four rounds of the Bob Hope Classic, which was a five-round (90 holes) event in 2009. Stricker wound up finishing third after the fifth and final round.
Who was the first golfer in PGA Tour history to finish below 260? That was Byron Nelson, who carded 259 at the 1945 Seattle Open.
Source: PGA Tour
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