There's an intriguing strategic battle in store tomorrow, with Mercedes being the only team to select the medium tyre to set their fastest Q2 times. There was some overnight rain that reset the track for FP3 and qualifying, causing a bit of track evolution, but no further rain during the day. If the rain continues to hold off, we can expect a more stable track tomorrow, with a one-stopper being clearly the way forward. However, we're likely to see many different permutations of one-stopper, using all three available compounds. Sochi is not the easiest of circuits to overtake on, so we can expect a big tactical fight in the pits and on the track tomorrow.