http://www.bbc.com/sport/formula1/43750717
Mercedes' Lewis Hamilton edged Kimi Raikkonen's Ferrari by just 0.007secs in second practice at the Chinese GP.
Hamilton made a couple of small errors on his fastest lap but the times suggest another close battle between Mercedes and Ferrari for the race win.
There was just 0.108secs between Hamilton and title rival Sebastian Vettel in fourth, with Valtteri Bottas' Mercedes third.
Hamilton is 17 points behind Vettel, who has won the first two races.
The world champion has said he cannot afford to lose any more ground to the German in the title race.
Hamilton was highly impressive in setting the fastest time in the first session on Friday, but the frontrunners closed in the second.
The Mercedes perhaps still has a small advantage, as Raikkonen set his fastest time a little later in the session when the track grip levels would have improved.
"It has been a good day," said Hamilton. "Ferrari were quick and Red Bull looked really fast on the long run. It's good to see all the times so close, but it means that we really need to bring our A game."
"It is not yet there where I want to be," said Vettel. "We are still looking. It is difficult to find the sweet spot but if you do then you can unleash the pace."
Mercedes' Lewis Hamilton edged Kimi Raikkonen's Ferrari by just 0.007secs in second practice at the Chinese GP.
Hamilton made a couple of small errors on his fastest lap but the times suggest another close battle between Mercedes and Ferrari for the race win.
There was just 0.108secs between Hamilton and title rival Sebastian Vettel in fourth, with Valtteri Bottas' Mercedes third.
Hamilton is 17 points behind Vettel, who has won the first two races.
The world champion has said he cannot afford to lose any more ground to the German in the title race.
Hamilton was highly impressive in setting the fastest time in the first session on Friday, but the frontrunners closed in the second.
The Mercedes perhaps still has a small advantage, as Raikkonen set his fastest time a little later in the session when the track grip levels would have improved.
"It has been a good day," said Hamilton. "Ferrari were quick and Red Bull looked really fast on the long run. It's good to see all the times so close, but it means that we really need to bring our A game."
"It is not yet there where I want to be," said Vettel. "We are still looking. It is difficult to find the sweet spot but if you do then you can unleash the pace."