Mercedes drivers George Russell and Kimi Antonelli have each failed to finish a race due to power unit battery failures - in Montreal and Barcelona, respectively - while the latter suffered a wheel cover failure last time out at Silverstone, denting his title hopes with an eventual P15 finish.

After Antonelli's five-race winning streak was broken following his DNF in Barcelona, Ferrari have won two of the last three Grand Prix races - the Scuderia now trail the Silver Arrows by 78 points in the Constructors'. A second victory of the season for Russell in Austria, as well as his P2 at Silverstone has also seen the 19-year-old's title lead reduced to just 25 points ahead of his teammate, while Ferrari's Lewis Hamilton is very much part of the conversation, only 32 points behind Antonelli.

Speaking in his preview of the Belgian GP this weekend, Mercedes boss Wolff lamented too many reliability problems for the Silver Arrows thus far, arguing that for all their superior pace in 2026, the Brackley-based team have failed to truly deliver on their potential.

Wolff said: "The last few races have underlined both where our strengths are and where we need to improve. We have a car capable of fighting at the front and scoring heavily, but we have not converted that potential into the best possible results.

Wolff then looked ahead to the task at Spa. The iconic circuit in the Ardennes hills is already the ultimate test for F1 drivers, but given the track's long straights and lack of energy recovery opportunities - similar to Silverstone - perhaps the 2026 grid face an even greater challenge than usual.

"Spa is one of the great challenges on the calendar," Wolff said. "Like Silverstone, energy management will play an important role, but the characteristics of the circuit create different demands. It usually produces exciting racing and genuine overtaking opportunities, while qualifying remains a significant test."

Outlining the team's goals as F1 approaches the summer break - with only the Belgian and Hungarian Grands Prix to go - Wolff could still not shake the fact Mercedes have dropped points over reliability, reiterating the team have "left too much on the table recently." He continued: "This is the final double header before the summer shutdown and we want to head into the break on a stronger note.

Elsewhere, Wolff has revealed the timeline behind his decision to sign Antonelli to the Mercedes driver programme, while also delivering a glowing verdict on the role the 19-year-old’s father, Marco Antonelli, has played in his development.

Speaking in an interview with Italian outlet La Gazzetta dello Sport, the Mercedes team principal explained that Antonelli’s debut campaign in 2025 was always expected to be a period of adaptation before making a significant step forward in his second season.

“We knew he needed a year to settle in and grow because Formula 1 is a completely different world compared to the smaller series. He had to adapt to the car and learn how to manage commitments with sponsors and the media," Wolff said.