Davide Valsecchi topped the times for Lotus on the final day of Formula 1's young driver test in Abu Dhabi.
The Italian, who won the GP2 title with DAMS this year, posted a time of 1m42.677s that was just 0.002 seconds quicker than Antonio Felix da Costa's best overall time on Wednesday for Red Bull.
McLaren's Kevin Magnussen was second fastest at the Yas Marina Circuit, 0.150s behind Valsecchi. Magnussen was back in the car after topping the timesheets on the opening day.
McLaren sporting director Sam Michael praised Magnussen's performance after the test, which was the young Dane's maiden Formula 1 outing.
"His pace, consistency and engineering feedback were all excellent," said Michael. "Given his performance, he certainly didn't look like a guy who had never turned a wheel in a modern F1 car before the start of this week."
Magnussen drove the car in the afternoon, while Oliver Turvey was in charge of testing duties in the morning. The Briton was fifth quickest.
Sauber's Esteban Gutierrez finished in third position after completing 80 laps. A place behind him was Red Bull's Robin Frijns, who returned to action following his outing with Sauber on Tuesday.
Luiz Razia returned to the wheel of the Toro Rosso he drove on the opening day to post the sixth quickest time of Thursday's session. The Brazilian, however, was running a fever and struggled during the day, although he still managed to complete his programme.
American Alexander Rossi was slowest for Caterham after having to finish his day early due to oil on the garage floor when he returned to the pits after his 14th run.
"That meant I didn't have the chance to do any performance runs and I'm sure if I did, my laptimes would have been close to the race drivers, but issues like that are just one of those things," said Rossi.
"They'll take a proper look at what caused the problem and I'm sure it won't affect the team's preparations for Austin or Brazil."
Pos Driver Team Time Laps 1. Davide Valsecchi Lotus-Renault 1m42.677s 86 2. Kevin Magnussen McLaren-Mercedes 1m42.827s + 0.150 51 3. Esteban Gutierrez Sauber-Ferrari 1m43.093s + 0.416 80 4. Robin Frijns Red Bull-Renault 1m43.233s + 0.556 53 5. Oliver Turvey McLaren-Mercedes 1m43.604s + 0.927 44 6. Luiz Razia Toro Rosso-Ferrari 1m45.286s + 2.609 68 7. Alexander Rossi Caterham-Renault 1m46.485s + 3.808 86