The result gave Mahindra Racing 38 points across the weekend and marked de Vries's second win of the 2025/26 FIA Formula E World Championship season and the sixth of his career. It is the first time the team has taken more than one race win in a season since 2017/18.
Rain had been forecast throughout the weekend for rounds 14 and 15 of the championship in Tokyo, Japan, and conditions shifted through the second race on Sunday, affecting tyre and strategy choices for the field.
In Saturday's race, Mortara started second after topping both practice sessions but finished fifth. De Vries suffered a puncture on the first lap and finished 17th.
On Sunday, Mortara topped the qualifying Duels stage, beating António Félix da Costa by six tenths of a second in the final to take pole position. It was his fourth pole of the season, equalling the record for most poles by a driver in a single Formula E season. De Vries qualified fifth.
The race started behind the safety car because of wet conditions. Mortara led from the start, while de Vries dropped to seventh in the opening laps.
Da Costa moved into the lead on lap three after an early Attack Mode deployment, passing Mortara. De Vries continued to lose ground, a result the team later attributed to tyre pressure settings chosen in anticipation of a drying track.
Mortara used his first Attack Mode on lap 14, closing to within a second of da Costa, but a full-course caution neutralised the race before he could attempt a pass. He was unable to retake the lead at the restart and lost positions as the track dried and tyre pressures became a factor in performance.
De Vries used an early two-minute Attack Mode activation to move up to sixth. On lap 26, he deployed his remaining six minutes of Attack Mode and moved through the field into the lead. Mortara had by that point fallen to tenth and activated his second Attack Mode.
In the closing laps, Mortara was involved in a multi-car incident that ended his race and brought out the red flag. De Vries held off Nick Cassidy and Jake Dennis over the final lap to take the win.
The victory moved de Vries to ninth in the drivers' standings; Mortara remains fifth. Mahindra Racing is fourth in the teams' standings with 210 points, one point behind third-placed Andretti with two rounds remaining. The next races, rounds 16 and 17, take place in London on August 15-16.
De Vries said the team had benefited from choosing a setup suited to a drying track. "We were a little bit lucky today. We opted for a drying track and in hindsight that worked out in our favour. We got a poor start, but I think it was very important to save energy at the beginning of the race because once the track dried, you needed it," he said. He added that the late red flag also worked in his favour, as Dennis had been closing on him under Attack Mode.
Mortara said his setup choice for the wet conditions at the start of the race had not paid off. "It's a disappointing result on a day when we showed quite a lot of performance. When you start from pole and everything is fully wet, there's very little to gamble. I started with the wet set-up, and this wasn't the right call," he said, adding that the team's decision to split strategy between the two cars had benefited de Vries.
Team principal and CEO Frederic Bertrand said the weekend had presented strategic and energy-management challenges, noting Mortara's fifth-place finish on Saturday and de Vries's race-winning drive on Sunday, which he said had a significant impact on the team's position in the championship.