Button disappointed with finish
Jenson Button believes he would have caught eventual Chinese Grand Prix winner Nico Rosberg, had it not been for a lengthy pit stop.
Button finished second behind Rosberg in Shanghai and was left to rue not being able to put the German under pressure during the final few laps.
"Our calculations say we would have caught Nico with two laps to go. To do three stops was the best, it just went a little wrong at the end. Our pace was very good and when I had five or six laps of clean air I was about two seconds a lap quicker than Nico," the 2009 champion told Sky Sports F1.
"The aim was to come out in front of the pack and that's what we would have done had we not lost six seconds at the pit stop. We could have chased them down - or at least put them under pressure."
Rosberg led from the front in Shanghai as Mercedes secured its first victory since the 1955 Italian Grand Prix. That left McLaren team-mates Button and Lewis Hamilton fighting it out for second.
While disappointed, Button took positives from the race.
"It was a great day for the team - there are just a couple of things we need to work on to make life easier for ourselves," he added.