Mercedes one-two in practice at Imola, problems for Red Bull

Mercedes driver Valtteri Bottas of Finland steers his car during the second free practice session for Sunday's Emilia Romagna Formula One Grand Prix, at the Imola track, Italy, Friday, April 16, 2021. (AP Photo/Luca Bruno)

Mercedes driver Lewis Hamilton of Britain steers his car during free practice for Sunday's Emilia Romagna Formula One Grand Prix, at the Imola track, Italy, Friday, April 16, 2021. (AP Photo/Luca Bruno)

Mercedes driver Lewis Hamilton of Britain steers his car during the second free practice session for Sunday's Emilia Romagna Formula One Grand Prix, at the Imola track, Italy, Friday, April 16, 2021. (AP Photo/Luca Bruno)

AlphaTauri driver Pierre Gasly of France steers his car during free practice for Sunday's Emilia Romagna Formula One Grand Prix, at the Imola track, Italy, Friday, April 16, 2021. (AP Photo/Luca Bruno)

Mercedes driver Valtteri Bottas of Finland steers his car during free practice for Sunday's Emilia Romagna Formula One Grand Prix, at the Imola track, Italy, Friday, April 16, 2021. (AP Photo/Luca Bruno)

Red Bull driver Max Verstappen of the Netherlands steers his car during free practice for Sunday's Emilia Romagna Formula One Grand Prix, at the Imola track, Italy, Friday, April 16, 2021. (AP Photo/Luca Bruno)

Red Bull driver Max Verstappen of the Netherlands steers his car during free practice for Sunday's Emilia Romagna Formula One Grand Prix, at the Imola track, Italy, Friday, April 16, 2021. (AP Photo/Luca Bruno)

Mercedes driver Valtteri Bottas of Finland is followed by Mercedes driver Lewis Hamilton of Britain during free practice for Sunday's Emilia Romagna Formula One Grand Prix, at the Imola track, Italy, Friday, April 16, 2021. (AP Photo/Luca Bruno)

Mercedes driver Lewis Hamilton of Britain steers his car during the second free practice session for Sunday's Emilia Romagna Formula One Grand Prix, at the Imola track, Italy, Friday, April 16, 2021. (AP Photo/Luca Bruno)