Max Verstappen, who faces a 10-place grid penalty for Sunday's race, topped the times for Red Bull ahead of McLaren's Oscar Piastri in Friday's opening free practice at this weekend's Belgian Grand Prix.As Verstappen began to trim his time, his 10-place grid penalty for taking a fresh engine was confirmed along with one for RB's Yuki Tsunoda who will start from the back of the grid after taking more power unit components.