The Clara man finished the BMW Championship on 5 under par.
Shane Lowry's solid performance at the BMW Championship has left the Clara golfer ranked 13th in the Fed-Ex Cup play-offs.
The 2019 Open Champion will start the Tour Championship on Thursday with seven shots to make up on the pre-tournament leader and world number one Scottie Scheffler.
Rory McIlroy will start a shot closer on four under par ahead of the PGA Tour finale.
On Thursday, Lowry starts his Tour Championship at 5.49pm with Adam Scott, while McIlroy begins at 6.38pm alongside Ludvig Aberg.
The Offaly golfer was full of praise for the Castle Pines course which hosted the BMW Championship, calling it "one of the best venues" he'd played on with the PGA Tour.
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