Nelson is among the 78 players battling at Egypt Valley CC in Ada, Mich., for the $165,000 winner's prize. Fleisher and Irwin are not.
Currently, Nelson stands third on the 2000 money list. At $1,773,355, he trails Irwin by $51,993 and Fleisher by $229,551. A fifth place finish or better this week will vault the 3-time 2000 victor into second place in seasonal earnings.
Others in the field this week includes: Allen Doyle, Gary McCord, Andy North, Gary Player and Lanny Wadkins.