"I wanted to have a good weekend and get a little bit of momentum going into the PGA," second-ranked Mickelson told reporters.
"So I'll have to kind of do what I did at Augusta, with Houston the week before. I played like this in Houston and I'm going to have to try to get it turned around here in three days."
Mickelson tied for 35th at the Houston Open in April before clinching his fourth major title in the US Masters at Augusta National the following week.