Taylor Barnard was fastest in the second practice session for the Miami E-Prix at Homestead-Miami Speedway, with Antonio Felix da Costa once again second.
Conditions were cooler than Friday's opening session, beginning less than half an hour after sunrise, but lap times were still quicker than Friday's hot late afternoon session, with the NEOM McLaren driver's pace-setting time of 1m23.339 0.446s quicker than Nick Cassidy's FP1 best.
TAG Heuer Porsche's da Costa was 0.190s back, with Mahindra's Nyck de Vries third another 0.081s adrift.
Mitch Evans and Jake Dennis completed the top five for Jaguar TCS Racing and Andretti respectively, with Norman Nato sixth for Nissan, and Edoardo Mortara putting both Mahindras into the top 10 in seventh.
Championship leader Oliver Rowland was eighth quickest in the other Nissan, ahead of reigning champion Pascal Wehrlein, with Stoffel Vandoorne rounding out the top 10 for Maserati MSG Racing.
Jean-Eric Vernge was 11th quickest, despite spinning on his final lap of the session. The DS Penske driver dropped a wheel onto the grass in Turn 1 and then went round after failing to collect the initial slide.
Sam Bird and David Beckmann – who completed a session-high 20 laps – were next up, ahead of Jake Hughes in 14th and Zane Maloney 15th. Dan Ticktum was 16th quickest, ahead of Friday pacesetter Cassidy, Maximilian Guenther, and Lucas di Grassi.
The Envision Racing pairing of Robin Frijns and Sebastien Buemi wound up 20th and 21st, with Nico Mueller finishing the session at the bottom of the timesheets, having only completed 10 laps.
The Andretti driver went into the solid concrete wall at the Turn 11 back stretch chicane, having locked up under braking. It was his firsts lap at full 350 kW power all weekend and team principal Roger Griffiths suggested that he misjudged his corner entry speed, resulting in the shunt.
While Mueller was unable to complete the session, Griffiths confirmed that the damage to Mueller’s car was not excessive but was “more than we can repair in the remainder of the session,” adding that "we'll be good to go for qualifying, so no concerns there."
Qualifying for the Miami E-Prix will take place at 9:40am local time.
