Impul Toyota driver Yuhi Sekiguchi set the pace in Super Formula's pre-event test session at Motegi, ahead of this weekend's first round of 2020.
SUPER GT points leader Sekiguchi set the pace at the very end of the two-hour session, which marked Super Formula's first running since March's pre-season test at Fuji Speedway.
He set a time of 1m33.717s after the chequered flag fell amid a late flurry of times to go top by just 0.012s ahead of Inging Toyota driver Hiroaki Ishiura.
Naoki Yamamoto (Dandelion Racing) was best of the Honda drivers in third, 0.075s off the pace, followed by Tomoki Nojiri (Mugen) and Nirei Fukuzumi (Dandelion).
Fukuzumi had been first to dip into the 1m33s bracket with two minutes go, deposing KCMG Toyota man Kamui Kobayashi with a 1m33.903s, but as the chequered flag fell Nojiri bettered that with a 1m33.871s before Sekiguchi, Ishiura and Yamamoto all improved.
Fuji test pacesetter Ryo Hirakawa was seventh, just under half a second behind Impul teammate Sekiguchi, while Kobayashi was demoted to eighth at the finish.
Reigning champion Nick Cassidy, who is going into his final Super Formula season for TOM'S as he moves to Formula E in 2021, was ninth-fastest, 0.492s off the pace, while his former teammate Kenta Yamashita (Kondo Racing) completed the top 10.