Ferrari’s Kimi Räikkönen led the way during the second day of the opening Formula 1 test at the Circuit de Barcelona-Catalunya, edging out Mercedes’ Lewis Hamilton.
Hamilton had been quickest during the morning session, clocking the benchmark time on Soft tyres, before he improved further when Super Softs were bolted to his Mercedes W08.
Hamilton set a time of 1:20.983 to lead proceedings in the morning session, but Räikkönen trumped his effort in the afternoon, registering a lap of 1:20.960, to move 0.023s clear.
Räikkönen’s time, which was over a second faster than last year’s Spanish Grand Prix pole lap, came on the Soft tyres, demonstrating the gains made under the revised Formula 1 regulations.
Räikkönen also enjoyed a trouble-free day in the SF70H, completing 108 laps.
Max Verstappen jumped into Red Bull’s RB13 for the first time and finished third, 1.2s behind Räikkönen and Hamilton, with 89 laps under his belt.
Following a handful of glitches upon his first day of running in the Haas VF-17, Kevin Magnussen enjoyed more a more fruitful time, racking up over 118 laps, the most for a single driver.
The Dane placed fourth, following a late effort on the Super Soft tyres, winding up just 0.004s adrift of Verstappen.
Esteban Ocon stopped on track due to a suspected mechanical issue shortly before the lunch break, having missed the opening two hours of running, following yesterday’s exhaust problem.
Ocon was nonetheless able to accumulate over a race distance’s worth of mileage, finishing fifth, ahead of Toro Rosso’ Daniil Kvyat, their best efforts coming on the Super Softs and Softs respectively.
Valtteri Bottas replaced Hamilton for the afternoon running, as Mercedes once again steamrollered the opposition with regards to mileage, amassing a combined 168 laps, with the Finn racking up 102 of those, despite missing the morning session.
Bottas conducted the first race simulation of pre-season testing, including live pit stops, though his spell was not without drama, as he lost control of the car through Turn 9, brushing the inside barriers.
Bottas was able to continue his race simulation, but came in for a fresh set of tyres as a precaution, and finished seventh overall.
Jolyon Palmer endured a frustrating morning as Renault fitted new parts to his RS.17, meaning he only took to the circuit a few minutes before the lunch break.
Palmer was able to rack up over a half century of laps before the end of running, placing eighth on the leaderboard.
Antonio Giovinazzi’s running was limited during the morning session as Sauber had to change the 2016-specification power unit in his C36-Ferrari.
Giovinazzi, substituting for the injured Pascal Wehrlein, was able to complete running during the afternoon and finished ninth overall, via a quick spin.
There was more strife for the beleaguered McLaren-Honda outfit, following restricted running on Monday.
Stoffel Vandoorne rolled back into the pit lane during the opening minutes and needed to be pushed back to the garage, though was soon able to return to action.
However, after around 20 laps, Honda was forced to change the power unit in his MCL32, meaning he returned for only the final 90 minutes of action.
Following a handful of installation laps, Vandoorne clocked a time which put him 10th, 4.6s behind Räikkönen, as he added some much-needed mileage to the car during the closing stages.
Lance Stroll was briefly the pacesetter in the first hour but he threw his Williams FW40 off the road exiting Turn 9 and skated through the gravel at high speed, before coming to a halt.
Stroll was able to recover to the pits, but his car had sustained damage to the winglets, and with no spare parts Williams was forced to abandon running for the day, after just 12 laps.
Testing continues at the Circuit de Barcelona-Catalunya on Wednesday.
| Pos | Driver | Team | Time | Gap | Tyre | Laps |
| 1 |  Kimi Raikkonen |
Ferrari | 1:20.960 |  |
108 | |
| 2 |  Lewis Hamilton |
Mercedes | 1:20.983 | 0.023 |  |
66 |
| 3 |  Max Verstappen |
Red Bull | 1:22.200 | 1.240 | |
89 |
| 5 |  Kevin Magnussen |
Haas | 1:22.204 | 1.244 | |
118 |
| 4 |  Esteban Ocon |
Force India | 1:22.509 | 1.549 | |
86 |
| 7 |  Daniil Kvyat |
Toro Rosso | 1:22.956 | 1.996 | |
68 |
| 6 | Valtteri Bottas |
Mercedes | 1:22.986 | 2.026 | |
102 |
| 8 | Jolyon Palmer |
Renault | 1:24.139 | 3.179 | |
53 |
| 9 |  Antonio Giovinazzi |
Sauber | 1:24.617 | 3.657 | |
67 |
| 11 |  Stoffel Vandoorne |
McLaren | 1:25.600 | 4.640 | |
40 |
| 10 |  Lance Stroll |
Williams | 1:26.040 | 5.080 |  |
12 |
