Mercedes is currently facing performance challenges with its Formula 1 car, the W17, which have created a noticeable gap between its two drivers, George Russell and Kimi Antonelli. The team is actively working to address these issues during the Singapore Grand Prix weekend. Following the introduction of major updates in Malaysia, Mercedes appears to have lost the development momentum, leading to difficulties in optimizing the car's performance. In Singapore, the team decided to run its two drivers in different configurations, with Russell using the older version of the W17 and Antonelli retaining the latest updates from Sepang. During the sprint qualifying session, the results were concerning, with Russell setting the second-fastest time, achieving a 573-millisecond advantage over Antonelli. This gap is not solely due to the technical differences between the two configurations but also highlights the challenges with the latest updates. According to The Race, the new setup suffers from a narrow operating range, causing the car to shift quickly from understeer to oversteer, making it harder for drivers to manage. These changes also lead to more tire slippage, reducing grip and lap times. Andrew Shovlin, head of track engineering at Mercedes, acknowledged the team's struggle, stating, "We need to understand why the updates are not delivering the performance gain we expected." Toto Wolff, the team principal, noted that while the new car may not necessarily be slower, it is "a bit more delicate to drive." He added that the older configuration appears more stable and offers better grip, but cautioned against drawing definitive conclusions after just one test session. In addition to these issues, Mercedes tested a new front wing during the first free practice sessions in Singapore. The modification included changes to the nose mounting pylons, which were moved back, and the last flap, whose chord was reduced. This new design aimed to allow the two upper elements of the wing to switch to low drag mode, which was previously only possible with one element. The goal was to change how the airflow reestablishes itself when the wing returns to its braking support configuration, which is crucial for the car's stability entering corners. However, the team removed this update after the first practice session, with both drivers returning to the older specification for the sprint qualifications. Mercedes clarified that this was a test to collect data and not a definitive abandonment of the update. The underlying issue appears to be more complex than just the front wing. Mercedes must determine whether the new package has inherent flaws or if it simply hasn't found the right settings to exploit its potential. Antonelli will continue using the updated car this weekend to allow for a more in-depth comparison. As the development of the 2027 chassis progresses, understanding what is not working becomes just as crucial as gaining a few tenths of a second in performance.