Jason Day reckons he's "kind of on par" after powering the Australian contingent with a five-under-par 66 to begin his AT&T Byron Nelson title defence in Texas.
The former world No.1 is three shots behind outright leader Matt Wallace at TPC Craig Ranch, while compatriot Min Woo Lee also shot a first-round 66 on Friday (AEST) to sit level with Day.
Harrison Endycott will begin his second round a further shot back from that pair, while Aaron Baddeley (68) and Adam Scott (69) completed a solid day for the Australian hopes.