スーパーフォーミュラ
In his first Super Formula start at Suzuka, he qualified third on the grid, ahead of Vandoorne, reigning Super Formula champion Kazuki Nakajima and his TOM's teammate Andre Lotterer, and Kamui Kobayashi. After two non-scoring races, Sekiguchi finally scored his first podium at Fuji Speedway, then at the following race at Motegi, he won in just his fourth career start, making him only the third Super Formula rookie without any prior experience in Formula 1 to win a race in the 21st century.