Round 3 was contested under wet regulations, with progression to Tsuiso determined by group results rather than outright scores. Shibakiri delivered the standout solo performance, producing a 98.20-point opening run that remained unbeaten despite a mistake on his second attempt. Naoki Nakamura finished second in Tansō ahead of Yumeto Hatanaka, while rookie Daiki Nishiyama impressed by advancing comfortably on his D1 Grand Prix debut. Former D1 champion Tsuyoshi Tezuka, along with Hokuto Matsuyama and Junya Ishikawa, failed to progress, while Taigo Saito was sidelined by gearbox problems before posting a run.
Changing grip levels returned for the tandem battles as light rain swept across the circuit. Several of the leading Tansō performers exited in the opening knockout stage, including Shibakiri, who spun while chasing Keiichi Nomura. Thailand's Lattapon Keawchin, competing as POP, emerged as one of the stories of the day by reaching the semi-finals after eliminating Ryu Nakamura and Kojiro Megusa with aggressive chase runs.
Yokoi's route to victory included defeating POP in the semi-finals before overcoming Naoki Nakamura in one of the closest finals of the season. Both drivers finished tied on combined chase scores, leaving Yokoi's stronger lead run to decide the contest and secure the Round 3 Tsuiso victory. Nakamura nevertheless left Tsukuba atop the championship standings.
Dry conditions on Sunday reshaped the competition, with Yokoi immediately carrying his momentum into the solo runs. His 95.41-point effort topped the session ahead of Hideyuki Fujino, Kojiro Megusa and Shibakiri, while POP again featured inside the top five despite failing to complete his second run.
The Round 4 Tsuiso bracket again belonged to Yokoi. After progressing through the knockout rounds, he defeated Shibakiri in the semi-finals before overcoming Megusa in the final to complete a clean sweep of the weekend's tandem competitions. The result capped the strongest weekend of Yokoi's 2026 campaign, proving his pace in both wet and dry conditions.
Although Yokoi leaves Tsukuba with maximum momentum, Nakamura's consistency across the opening four rounds keeps him at the top of the championship standings. Shibakiri's maiden Tansō victory and POP's breakthrough semi-final appearance added further depth to a weekend that produced standout performances across changing conditions.
