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HUMBLE, TEXAS (AP) -- Phil Mickelson shot his lowest round in two years on Saturday, tying the course record with a 9-under 63 to share the lead with Scott Verplank after three rounds at the Houston Open.

Verplank shot his second straight 65 to catch Mickelson at 13-under par.

Aaron Baddeley (66) and second-round leader Chris Kirk (69) were one stroke back, and defending champion Anthony Kim and David Hearn (66) were two behind.

Mickelson, the defending champion at next week's Masters, equaled the record score set by Johnson Wagner and Adam Scott in 2008 and matched by Jimmy Walker on Thursday. It was Lefty's best round since an opening 62 at the 2009 Northern Trust Open, which he won.

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