Mercedes Formula 1 reserve George Russell set the fastest time on the final day of the opening pre-season Formula 2 test at Paul Ricard, ahead of his team-mate Jack Aitken.
The ART Grand Prix pair set the fastest times of the day during the morning running, with Prema Racing's Nyck de Vries completing the top three.
McLaren junior Lando Norris finished the day in eighth place overall, but held onto the fastest overall time of the test, a 1m42.226 that he set on day two.
Russell and Aitken traded the top spot between them during the early running, before the 2017 GP3 champion put in a 1m42.396, which remained unbeaten as the teams switched to race simulations.
Aitken ended up 0.162s adrift, with de Vries 0.363 behind Russell, in a morning session that was interrupted by four red flags.
DAMS driver Alexander Albon set the fastest time in the afternoon session, during which the teams continued to focus on longer running.
Haas F1 development driver Arjun Maini wound up fifth fastest for Trident ahead of Louis Deletraz (Charouz Racing System) and Carlin's Sergio Sette Camara.
Dan Ticktum, the 2017 Macau Grand Prix and McLaren Autosport BRDC Award winner who was experiencing his first taste of F2-level machinery in place of Nicholas Latifi at DAMS, set the ninth quickest time of the day.
Maximilian Gunther rounded out the top 10 for Arden International, setting his best time during the afternoon session after bringing out the red flags just after the lunchbreak.
Sean Gelael (Prema) also caused a stoppage late on in the afternoon, after Charouz's Fuoco, Russian Time driver Artem Markelov, Ralph Boschung (MP Motorsport) and Campos' Roy Nissany - 12th, 13th, 16th and 19th overall respectively - had done likewise during the morning running.
Gelael ended up 15th fastest, with Maini's team-mate and fellow Haas junior Santino Ferrucci 18th, while former Manor F1 driver Roberto Merhi brought up the rear of the field for MP.
The second and final F2 pre-season test takes place in Bahrain on March 21-23, with the 2018 season getting underway at the same venue on April 6-8 on the undercard of the Bahrain Grand Prix.
|1||George Russell||ART Grand Prix||1m42.396s||-||47|
|2||Jack Aitken||ART Grand Prix||1m42.588s||0.192s||56|
|3||Nyck de Vries||Pertamina Prema Theodore Racing||1m42.759s||0.363s||32|
|5||Louis Deletraz||Charouz Racing System||1m43.239s||0.843s||43|
|6||Sergio Sette Camara||Carlin||1m43.269s||0.873s||25|
|8||Maximilian Gunther||BWT Arden||1m43.350s||0.954s||35|
|9||Nirei Fukuzumi||BWT Arden||1m43.501s||1.105s||28|
|11||Artem Markelov||RUSSIAN TIME||1m43.575s||1.179s||41|
|12||Sean Gelael||Pertamina Prema Theodore Racing||1m43.731s||1.335s||31|
|13||Luca Ghiotto||Campos Vexatec Racing||1m43.755s||1.359s||30|
|15||Antonio Fuoco||Charouz Racing System||1m43.899s||1.503s||25|
|16||Ralph Boschung||MP Motorsport||1m43.948s||1.552s||26|
|17||Roy Nissany||Campos Vexatec Racing||1m44.048s||1.652s||35|
|18||Tadasuke Makino||RUSSIAN TIME||1m44.164s||1.768s||46|
|20||Roberto Merhi||MP Motorsport||1m44.377s||1.981s||49|
|5||Maximilian Gunther||BWT Arden||1m43.330s||0.407s||49|
|6||Louis Deletraz||Charouz Racing System||1m43.428s||0.505s||50|
|7||Antonio Fuoco||Charouz Racing System||1m43.572s||0.649s||48|
|8||Sergio Sette Camara||Carlin||1m43.597s||0.674s||36|
|9||Luca Ghiotto||Campos Vexatec Racing||1m43.610s||0.687s||35|
|10||Tadasuke Makino||RUSSIAN TIME||1m43.961s||1.038s||30|
|12||Sean Gelael||Pertamina Prema Theodore Racing||1m43.998s||1.075s||46|
|13||Ralph Boschung||MP Motorsport||1m44.163s||1.240s||15|
|14||Artem Markelov||RUSSIAN TIME||1m44.250s||1.327s||33|
|15||George Russell||ART Grand Prix||1m44.356s||1.433s||60|
|16||Nyck de Vries||Pertamina Prema Theodore Racing||1m44.742s||1.819s||48|
|17||Roy Nissany||Campos Vexatec Racing||1m44.782s||1.859s||46|
|18||Nirei Fukuzumi||BWT Arden||1m44.844s||1.921s||31|
|19||Roberto Merhi||MP Motorsport||1m44.909s||1.986s||31|
|20||Jack Aitken||ART Grand Prix||1m45.252s||2.329s||26|